Nullify

Nullify

<nole-la-feye>

Void; undo; invalidate;

to cancel something or make it worthless.

I will nullify the bill and you won't have to pay anything.

Memory trick:
Nullify reminds of null or nothing.

At work:
Making deadlines ensures they won't nullify the contract.

(c) 2015 E. Carruthers