Answer:

renigs

Answer	Crossword Clue
RENIGS	Breaks one's word: Colloq.
RENIGS	Errs at bridge: Colloq.
RENIGS	Errs at bridge: Var.

RENIGS	Backs down on a promise

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.