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fool around

B1 informal inseparable intransitive
In simple words

Act silly and waste time, or (for adults) have a secret romantic relationship.

Literal meaning: To move around (in circles) like a fool — without purpose.

Meanings

1 B1 idiomatic informal

To behave in a playful or silly way, especially when one should be focused or serious.

"The kids were fooling around in the garden instead of coming in for dinner."

"Stop fooling around and get to work."

— Common idiom, widely cited in American popular culture
Grammar: inseparable
2 B1 idiomatic informal

To waste time on unimportant or unproductive activities.

"We can't afford to fool around — the deadline is tomorrow."

Grammar: inseparable
3 B2 idiomatic informal

To have a casual or secret sexual relationship outside of a committed partnership.

"She suspected her husband was fooling around behind her back."

Grammar: inseparable
4 B1 idiomatic informal

To experiment or tinker casually with something.

"He likes to fool around with old car engines on weekends."

Grammar: inseparable
Usage notes

Common across all English-speaking regions, though especially American. Context makes the intended sense clear. The sexual sense is adult and can be offensive in inappropriate contexts. Used as a mild warning: 'Don't fool around!'

Commonly used with

time class partner work relationship computer

Forms

Base
fool around
I/you/we/they
3rd person
fools around
he/she/it
Past simple
fooled around
yesterday
Past participle
fooled around
have + pp
-ing form
fooling around
continuous

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