/ rɪˈniːg; NAmE ; rɪˈneɪg/ verb
[ v ] renege (on sth) ( formal ) to break a promise, an agreement, etc.
SYN go back on :
to renege on a deal / debt / contract, etc.
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WORD ORIGIN
mid 16th cent. (in the sense desert ): from medieval Latin renegare , from Latin re- (expressing intensive force) + negare deny.