[with obj.]make legally null and void; invalidate 使无法律效力;使无效;否定 judges were unwilling to nullify government decisions. 法官们不愿意否定政府决策的合法性。 ■make of no use or value; cancel out 使无用,使无价值;抵消 insulin can block the release of the hormone and thereby nullify the effects of training. 胰岛素能阻碍激素的释放,从而抵消训练的效果。