To violate, do violence to; to fail to observe or keep; to transgress. (The opposite of to keep sacred… an oath, promise, pledge, vow, one's…

transitive. To violate (a commandment, agreement, promise, etc.); to fail to observe or keep.

To be or prove false to. To break, violate (one's faith, word, etc.). Const. dative of person.

transitive. To fail to keep or observe (an oath or promise, one's faith, etc.). Now somewhat archaic.

transitive. To retract (a promise); to retract a promise made to (someone). Also intransitive.

to go back on (also upon). To break (a promise); to renege on (an agreement, decision, etc.). Frequently in to go back on one's word. Cf. sense 2a.