專擅

专擅
zhuānshàn
  1. without authorization
  2. to act on one's own initiative

CEDICT

  1. to make an arbitrary decision; to act arbitrarily
  2. to usurp authority

Wiktionary

獨斷獨行。

重編國語辭典

Entry Composition

1 專 zhuān
  1. for a particular person, occasion, purpose
  2. focused on one thing
  3. special
  4. expert
  5. particular (to sth)
  6. concentrated
  7. specialized
2 擅 shàn
  1. without authority
  2. to usurp
  3. to arrogate to oneself
  4. to monopolize
  5. expert in
  6. to be good at