Increase and Its Opposite: Simple Guide
If you are learning English, you will quickly notice that the verb increase is everywhere. It means to become larger in amount, size, strength, or degree. Its direct opposite is decrease, which means to become smaller or less. This guide gives you a clear, practical understanding of both words, their common uses, and how to avoid mistakes when using them in writing, email, and everyday conversation.
Quick Answer: What Is the Opposite of Increase?
The most common and direct opposite of increase is decrease. Both words can be used as verbs or nouns. For example:
- Increase (verb): Sales increased last quarter.
- Decrease (verb): Sales decreased last quarter.
- Increase (noun): There was an increase in temperature.
- Decrease (noun): There was a decrease in temperature.
Other common opposites include reduce (more common in instructions) and drop (more informal). But for a beginner, decrease is the safest and most accurate choice.
Understanding Increase and Decrease
Formal vs. Informal Tone
Increase and decrease are neutral words. You can use them in formal reports, academic writing, business emails, and casual conversation. However, in very informal speech, native speakers often prefer simpler words:
- Go up instead of increase: “Prices went up.”
- Go down instead of decrease: “Prices went down.”
- Cut instead of decrease: “We need to cut costs.”
In formal writing, stick with increase and decrease. In emails to colleagues, you can mix them. In conversation with friends, go up and go down sound more natural.
Email and Conversation Context
In a business email, you might write:
“We expect a 10% increase in revenue next quarter.”
In a conversation, you would more likely say:
“Our revenue should go up by about 10%.”
For the opposite, in an email:
“We need to decrease our spending on office supplies.”
In conversation:
“We have to cut back on office supplies.”
Comparison Table: Increase vs. Decrease
| Aspect | Increase | Decrease |
|---|---|---|
| Meaning | Become larger or greater | Become smaller or less |
| Part of speech | Verb and noun | Verb and noun |
| Formal use | Very common in reports, academic papers, business | Very common in reports, academic papers, business |
| Informal alternative | Go up, rise, grow | Go down, drop, fall, cut |
| Common collocations | Increase in price, increase in demand, increase in temperature | Decrease in sales, decrease in speed, decrease in quality |
| Example sentence | The company saw an increase in profits. | The company saw a decrease in profits. |
Natural Examples
Here are real-life sentences using increase and decrease in different contexts:
Everyday Conversation
- “My phone bill increased this month. I need to check my plan.”
- “The temperature decreased overnight, so bring a jacket.”
- “We should increase our water intake during summer.”
- “The number of students in the class decreased after the holidays.”
Business and Work
- “We need to increase our marketing budget to reach more customers.”
- “The manager decided to decrease the team size to save costs.”
- “There was a steady increase in website traffic after the campaign.”
- “A decrease in customer satisfaction is a serious warning sign.”
Academic and Study Context
- “The study showed an increase in test scores after the new teaching method.”
- “Researchers observed a decrease in errors when participants had more time.”
- “We can increase our vocabulary by reading every day.”
- “To decrease confusion, the teacher explained the rule again.”
Common Mistakes
Even advanced learners sometimes make these errors. Watch out for them:
Mistake 1: Using “increase” when you mean “decrease”
Incorrect: “We need to increase the number of errors.”
Correct: “We need to decrease the number of errors.”
Mistake 2: Confusing the noun and verb forms
Both increase and decrease can be nouns or verbs. The spelling stays the same, but the pronunciation changes slightly. As a verb, the stress is on the last syllable: in-CREASE, de-CREASE. As a noun, the stress is on the first syllable: IN-crease, DE-crease.
Example:
Verb: “Sales increase every year.” (in-CREASE)
Noun: “There is an increase in sales.” (IN-crease)
Mistake 3: Using “more increase” or “more decrease”
Do not say “more increase” or “more decrease.” Instead, use greater increase or larger decrease.
Incorrect: “We saw a more increase in profits.”
Correct: “We saw a greater increase in profits.”
Mistake 4: Forgetting prepositions
We say increase in something, not increase of something (when talking about a subject).
Incorrect: “There was an increase of temperature.”
Correct: “There was an increase in temperature.”
But we do say increase of when giving a number: “an increase of 10%.”
Better Alternatives: When to Use Them
Sometimes increase and decrease are not the best choice. Here are alternatives and when to use them:
Instead of “increase”
- Rise – Use for natural or gradual upward movement. “The sun rises.” “Prices rise slowly.”
- Grow – Use for development over time. “The business grew quickly.” “Her confidence grew.”
- Expand – Use for physical size or scope. “The company expanded to new markets.”
- Boost – Use for a quick or intentional increase. “The ad campaign boosted sales.”
Instead of “decrease”
- Reduce – Very common in instructions and goals. “Reduce your sugar intake.”
- Drop – Informal, often sudden. “The temperature dropped sharply.”
- Fall – Similar to drop, but can be gradual. “Stock prices fell yesterday.”
- Cut – Use when someone intentionally reduces something. “We need to cut expenses.”
When to stick with “increase” and “decrease”
Use increase and decrease when you want to be neutral, clear, and professional. They are the safest choices in most formal and semi-formal situations. If you are writing a report, an academic paper, or a business email, these words are your best friends.
Mini Practice: Test Yourself
Choose the correct word (increase or decrease) for each sentence. Answers are below.
- To save money, we need to _______ our electricity usage.
- The population of the city continues to _______ every year.
- There was a sudden _______ in temperature, so it became much colder.
- Regular exercise can _______ your energy levels.
Answers
- decrease – “To save money, we need to decrease our electricity usage.”
- increase – “The population of the city continues to increase every year.”
- decrease – “There was a sudden decrease in temperature, so it became much colder.”
- increase – “Regular exercise can increase your energy levels.”
Frequently Asked Questions
1. Can “increase” and “decrease” be used as nouns?
Yes. Both words are commonly used as nouns. For example: “We saw an increase in sales.” “There was a decrease in attendance.” The noun form is very common in business and academic writing.
2. What is the difference between “decrease” and “reduce”?
Decrease can be used as both a verb and a noun, and it often describes something that happens naturally. Reduce is almost always a verb and implies someone is intentionally making something smaller. For example: “The number of errors decreased” (natural change). “We reduced the number of errors” (intentional action).
3. Is “increase” always positive?
No. While an increase in salary or happiness is positive, an increase in problems, costs, or pollution is negative. The word itself is neutral; the context gives it a positive or negative meaning.
4. How do I remember the difference between “increase” and “decrease”?
Think of the prefix in- as meaning “into” or “up” (like “in” or “upward”), and de- as meaning “down” or “away” (like “downward”). You can also remember that “increase” has the letter “i” which looks like a line going up, and “decrease” has the letter “d” which looks like a line going down.
Final Tips for Learners
To master these words, practice using them in your own sentences. Write one sentence with increase and one with decrease every day for a week. Pay attention to whether you are using them as verbs or nouns. Listen for them in news reports, podcasts, and conversations. Over time, using these words correctly will feel natural.
For more help with basic word pairs, visit our Beginner Vocabulary Pairs section. If you have questions about other opposites, check our FAQ page or contact us directly. We are here to help you build your English vocabulary step by step.
