The Oxford Thesaurus An A-Z Dictionary of Synonyms - renegev.

1) Cards revoke: When you renege you fail to follow suit. 2) go back on, back out, default, repudiate, go back on or break (one's) promise or word, recant, abrogate, abjure, Slang welsh (on) : You swore you would keep your word, and now you're reneging.