break + vow
break-vow (plural break-vows)
- (obsolete, derogatory) An untrustworthy person; someone who habitually breaks vows and promises.
c. 1595, Shakespeare, William, King John, act 2, scene 1:
With that same purpose-changer, that sly devil, / That broker, that still breaks the pate of faith, / That daily break-vow, he that wins of all, / Of kings, of beggars, old men, young men, maids,