假充

jiǎchōng
  1. to pose as sb
  2. to act a part
  3. imposture

CEDICT

冒充。《醒世恆言．卷三六．蔡瑞虹忍辱報仇》：「每常有下路糧船，運糧到京，交納過後，那空船回去，就攬這行生意，假充座船，請得個官員坐艙，那船頭便去包攬他人貨物，圖個免稅之利。」《紅樓夢．第二回》：「夫妻無子，故愛女如珍；且又見他聰明清秀，便也欲使他讀書識幾個字，不過假充養子之意，聊解膝下荒涼之歎。」也作「假冒」。

重編國語辭典

Entry Composition

=1 假 jiǎ
  1. fake
  2. false
  3. artificial
  4. to borrow
  5. if
  6. suppose
=1 假 jiǎ
  1. variant of 假 jiǎ
  2. to borrow
2 充 chōng
  1. sufficient; full
  2. to fill
  3. to serve as; to act as
  4. to act falsely as; to pose as

Related entries

裝作 zhuāngzuò
  1. to pretend
  2. to feign
  3. to act a part
他裝作沒在聽。

He pretended not to be listening.

Source: Tatoeba