切り崩し

きりくずし【切り崩し】

cutting [whittling] away at sth till it collapses [falls down, falls apart]; undermining; leveling; 〔相手勢力の団結を弱めること〕 undermining; whittling away at 《an opponent》.

●反対勢力の切り崩しに努める work away at undermining an opposite force.

●切り崩しをやる ＝きりくずす.