置诸脑后
zhì​zhū​nǎo​hòu

to banish from one's mind

  1. 置 zhì
    to set aside
    (literary) to discard; to abandon; to leave alone
  2. 诸 諸 zhū verb
    fusion of zhī and yú
    (literary) fusion of the pronoun 之 zhī and the preposition 于 yú; functions like "him/her/it/them" plus "to/at/in"
  3. 脑后 腦後 nǎo​hòu locative
    behind oneself
    the back of one's mind; used figuratively to describe things that have been forgotten, ignored, or disregarded