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English definition of “estoppel”

estoppel

noun [S or U]     /eˈstɒpl/ LAW
a legal rule which prevents someone from saying in court that something they have previously stated as true in court, or that has been established by the court as true, is in fact not true: The Court held that there was no estoppel.
(Definition of estoppel noun from the Cambridge Business English Dictionary © Cambridge University Press)
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