What is Reneg?
1.
Misspelling of "renege". Almost certainly formed by incorrectly identifying the root for the past tense (reneged) which is more common than the present tense. Renege means to fail to keep a commitment or promise.
He reneged on the deal.
See
2.
Slang abbreviation of the term renegotiate; to go back on or review a deal already finalized or closed.
He reneged on the deal.