whack off

• • [美国俚语](男性)性自慰，手淫；对…行手淫[亦作 jack off，jerk off]
  • [口语]打掉，打下来；降下来，削价：

    Filling stations have whacked as much as a dime off their regular prices.

    加油站已经把正常价格降了一角银币。