renege
1. [ verb ] fail to fulfill a promise or obligation
Synonyms: renegue_on go_back_on renege_on
Examples:

"She backed out of her promise"

Related terms: revoke promise
2. [ noun ] (cards) the mistake of not following suit when able to do so
Synonyms: revoke
Related terms: mistake card_game
Similar spelling:   Reinke
  Reynaga
  Reineke
  Reineck
  Reinecke
  reins