verb
to prevent or hinder someone from doing something, typically by legal means
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The doctrine of estoppel prevents a party from asserting a claim or defense that is inconsistent with a previous position or representation.
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You can't change your story now, you're estopped from denying what you said before.
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She tried to pull a fast one on me, but I estopped her with the evidence.
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His reputation as a liar estops him from being taken seriously in any argument.