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[C] a person who behaves in a silly way without thinking[as form of address] You fool, you've missed your chance!
He's a fool if he thinks she still loves him.
[+ to infinitive] He's a fool to think she still loves him.
He's fool enough to think she still loves him.
My fool of a (= silly) husband has gone out and taken my keys!
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[C] in the past, a person who was employed in the court of a king or queen to make them laugh by telling jokes and doing funny thingsact/play the fool to behave in a silly way, often intentionally to make people laughStop acting the fool, I'm trying to talk to you.
any fool anyoneAny fool could tell that she was joking.
make a fool of sb to trick someone or make them appear stupid in some way
make a fool of yourself to do something that makes other people think you are silly or not to be respectedI got a bit drunk and made a fool of myself.
more fool sb mainly UK said to mean that you think someone is being unwise"I lent Rhoda $100 and she hasn't paid me back." "More fool you - you know what she's like!"
be no fool (also be nobody's fool) to not be stupid or easily deceivedI notice Ed didn't offer to pay for her - he's no fool.