A fool is someone who acts in a silly or unwise way, often ignoring good advice or obvious facts. As a verb, to fool someone means to trick or deceive them.
“Fool” comes from Old French “fol,” meaning “mad” or “foolish,” from Latin “follis,” a word for a bellows or a bag full of air, suggesting emptiness or puffiness. The idea shifted to someone “full of hot air.”
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