補刀

补刀
bǔdāo
  1. (gaming) to finish off a wounded combatant
  2. (fig.) to attack sb who is already under fire
  3. to pile on
  4. (sphragistics) to retouch a seal after taking a first impression

CEDICT

gaming

Entry Composition

1 補 bǔ
  1. to repair
  2. to patch
  3. to mend
  4. to make up for
  5. to fill (a vacancy)
  6. to supplement
2 刀 dāo
  1. (slang) (loanword) dollar
  2. classifier for sets of one hundred sheets (of paper)
  3. classifier for knife cuts or stabs
  4. (Internet slang) to bargain; to ask for a small discount (esp. on second-hand marketplaces)

classifier: 把