Estoppel is defined as a legal principle that stops someone from asserting a truth that is defined as contradictory to an already established truth.
(noun)If the court has established in a criminal trial that someone is guilty of murder, the legal doctrine preventing the murderer from denying his guilt in a civil trial is an example of estoppel.
See estoppel in Webster's New World College Dictionary
noun
Origin: OFr estoupail, stopper, bung < estoper: see estop
See estoppel in American Heritage Dictionary 4
noun
Origin:
Origin: Obsolete French estouppail
Origin: , from Old French estouper, to stop up
Origin: , from Vulgar Latin *stuppāre; see stop
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