drive a hard bargain [draiv ə hɑrd ˈbɑ:ɡin]

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附加级

杀价，迫使对方接受苛刻条件

You can drive a hard bargain in the free market.在自由市场上你可使劲地讨价还价。
Don't drive a hard bargain over such a little thing.别为这点小东西拼命砍价。