What does estop mean?
Estop is a legal verb meaning to prevent or bar someone from asserting a claim, right, or position that contradicts something they previously said, did, or allowed. Rooted in the doctrine of estoppel, the principle is that a person should not be permitted to act inconsistently with their earlier representations when others have relied on them to their detriment. For example, if a landlord accepts rent under an agreement they later deny exists, a court may rule that they are estopped from disputing that agreement. The word appears almost exclusively in formal legal writing and courtroom argument, usually in the passive form 'to be estopped from doing something'. Its noun counterpart, estoppel, is among the most important concepts in common-law jurisdictions, making this small but precise word essential vocabulary for anyone navigating contracts, property disputes, or civil procedure.
verbTo bar or preclude someone from asserting or denying a fact or legal claim, typically because their own prior words, conduct, or representations make it unjust for them to do so.
- (Law) To preclude or bar (a person) from asserting a claim or right inconsistent with their previous position, assertions, or conduct; to create an estoppel against.
"The landlord was estopped from evicting the tenant after accepting rent under the renewed lease."
"The court held that the company's silence and acceptance of payments had estopped it from later disputing the contract's validity."
"Having represented to investors that the funds were secure, the directors were now estopped from arguing otherwise."
In law, you can be silenced by your own words — 'estop' is the verb that makes your past statements legally binding against you.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of estop
Estop derives from the Anglo-Norman and Old French verb 'estopper', meaning 'to stop up' or 'to hinder', formed from the same Germanic root that gave English 'stop'. It entered English legal terminology during the Middle Ages as courts developed the doctrine of estoppel, which bars parties from contradicting their established positions. The word shares its ultimate Germanic origin with the everyday verb 'stop', making them true etymological siblings despite their divergent registers.
Related word forms
How estop is actually used
A formal term used almost exclusively in legal contexts. It is nearly always found in passive constructions ('was estopped', 'is estopped from') and typically followed by 'from' plus a gerund. The corresponding noun, 'estoppel', is more frequently encountered than the verb itself.
Easily confused with estop
While 'stop' means to cease movement or action generally, 'estop' is a narrow legal term meaning to bar someone from making a claim due to their own prior statements or conduct.