置之脑后 [- - nǎo hòu]ignore and forget; disregard; place ... in the back of one's brain [mind]; banish ... from one's mind; cast (past deeds, etc.) behind one's back; consign [commit] to oblivion; put out of mind; put ... clean out of one's head:
•¶ 为了达到个人目的， 他把集体利益置之脑后。 To accomplish his own end, he placed collective interests in the back of his mind.