noun
estoppel
A legal doctrine preventing a party from asserting something contrary to what is implied by a previous action or statement. Used in legal contexts.
禁反言の法理により、その主張は認められなかった。
Under the doctrine of estoppel, that claim was not accepted.
A compound of 禁 (prohibition) and 反言 (contradiction), likely a calque from English 'estoppel' or a related legal concept.