[with obj.][usu. as adj. countervailing]offset the effect of (something) by countering it with something of equal force 对抗;抵消 the dominance of the party was mediated by a number of countervailing factors. 该党的优势被许多对立因素削弱了。
语源
late Middle English (in the sense 'be equivalent to in value, compensate for'): from Anglo-Norman French contrevaloir, from Latin contra valere 'be of worth against'