凑足数额to make complete

充数to serve as a stopgap

• 拉来凑数

  be roped in to make up the numbers

• 派我去凑数。

  Send me along to make up the numbers.

• 拿坏材料凑数

  use low-grade material as a stopgap

• 这显然是为了凑数。

  This is clearly just to make up the numbers.