Possible Clues:

• Fail to keep your word
• Go back on your word
• Renounce
• Fail to keep promise, or revoke in cards
• Go back on promise
• Go back on one's promise
• Change one's mind, say, taken in by Frenchman
• Bridge infraction
• Frenchman, say, on the way back, to revoke at cards
• Welsh like interrupting Frenchman