約やく束そく破やぶる

expression, godan verb (-ru)

break a promise; go back on one's word; renege

Direct expression for failing to keep a promise. Often used in personal or informal contexts. Cross-referenced with the more common 約束を破る, which is the standard form with the object marker を.

See also: 約束を破る

• 彼かれは簡かん単たんに約やく束そく破やぶるから、もう信しんじられない。

  He breaks promises so easily that I can't trust him anymore.

• 約やく束そく破やぶるようなことはしないでほしい。

  I hope you won't do something like break your promise.