Third person singular present tense of estop; prevents or bars someone from making a contradictory legal argument.
From estop (verb) + -s third person singular marker. Estop entered English from Old French estopper through legal tradition in medieval England.
The word 'estop' is rare in everyday English but powerful in courtrooms—it's the legal system's way of enforcing honesty by preventing you from contradicting yourself when others have relied on your word.
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