Be cool vs Relax

When to use each in English, with meaning, register, and examples.

Be cool

InformalTop 2,000 (common)

Relax

Top 1,000 (very common)A1verb
Most formal: RelaxMost common: Relax
 Be coolRelax
Pronunciation🇬🇧 //biː kuːl//🇺🇸 //bi kul//🇬🇧 /["/rɪˈlæks/","/rɪˈlæksɪz/","/rɪˈlækst/","/rɪˈlæksɪŋ/"]/🇺🇸 /["/rɪˈlæks/","/rɪˈlæksɪz/","/rɪˈlækst/","/rɪˈlæksɪŋ/"]/
MeaningStay calm and relaxed.To make yourself feel calm and not stressed.
ExampleJust be cool; everything will turn out fine.After a long day at work, I like to relax on the couch with a good book.
RegisterInformalNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
CEFR level-A1
Part of speechverb
Collocationsbe cool about something, just be cool, be cool under pressurecompletely, fully, totally, begin to, try to, learn to, against, into, on, lie back and relax, sit back and relax, relax and enjoy something/​yourself, completely, fully, totally, begin to, try to, learn to, against, into, on, lie back and relax, sit back and relax, relax and enjoy something/​yourself, completely, fully, totally, begin to, try to, learn to, against, into, on, lie back and relax, sit back and relax, relax and enjoy something/​yourself
Antonyms-stress, tense, worry
Common mistakesConfused with 'be cruel' - they have opposite meanings., Used in formal contexts - avoid in business meetings., 'Be cool' misused with serious topics - it's too casual.'Relax' is sometimes confused with 'release' as if both mean the same thing., Learners may forget to use an object, saying just 'I relax' instead of 'I relax myself'., Some might use 'relax' inappropriately with a negative tone, which can sound confusing.
Usage notesUsed informally to encourage someone to relax or remain calm. Not typically used in formal situations.Use 'relax' when talking about making oneself calm. It's suitable for most contexts, but avoid using it in very formal occasions.

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Be cool
Relax

Frequently asked questions: Be cool vs Relax

What's the difference between Be cool and Relax?

Be cool: Stay calm and relaxed. Relax: To make yourself feel calm and not stressed.

Which is more formal: Be cool and Relax?

Relax is the most formal of these.

Which is more common: Be cool and Relax?

Relax is the most common in everyday English.

Can you show an example of each?

Be cool: Just be cool; everything will turn out fine. Relax: After a long day at work, I like to relax on the couch with a good book.

Can I use Be cool and Relax interchangeably?

Not always. Be cool and Relax are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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