estop/ɪˈstɒp/EtymologyInherited from Middle English estoppen (“to prevent (conception)”), from Anglo-Norman and Old French estoper, from a Late Latin stuppō.verbTo impede or bar by estoppel.“[…] we twitted them, while we were together in the sun of the Continent, about English heating habits. Having done that, we are now estopped from bringing the matter up.”To stop up; to plug.