打下手

dǎxiàshǒu
  1. to act in a supporting role
  2. fig. to play second fiddle

CEDICT

  1. (colloquial) to act as an assistant; to help someone
  2. to act as an assistant; to help someone

Wiktionary

Entry Composition

1 打下 dǎxià
  1. to lay (a foundation)
  2. to conquer (a city etc)
  3. to shoot down (a bird etc)
2 手 shǒu
  1. hand
  2. (formal) to hold
  3. person engaged in certain types of work
  4. person skilled in certain types of work
  5. personal(ly)
  6. convenient
  7. classifier for skill

classifiers: 雙, 隻