break one's promise

break one's promise (third-person singular simple present breaks one's promise, present participle breaking one's promise, simple past broke one's promise, past participle broken one's promise)

1. To break an assurance, bond or commitment one has made.

   Synonyms: go back on one's word, break one's word, renege on one's promise

   Antonyms: keep one's promise, stay true to one's word, be as good as one's word, deliver the goods

• “break a promise”, in Collins English Dictionary.
• “breach of promise”, in Collins English Dictionary.