Sometimes body surfing can turn into an all-out knockdown fest from the ocean.

有时，冲浪会演变成全力以赴对抗大海的狂欢。

youdao

You can get a house for a knockdown price but it may turn out to be a knockdown home.

你可以以跳楼价得到一间房子，但是那间房子说不定就要跳楼了。

youdao

The best that can now be hoped for is that the thrills of ownership precious few and dearly bought can be sold on at a knockdown price.

ECONOMIST: Horse-racing

But when a counterfeit classic is so good that even the experts are impressed, some buyers just can't resist the object of their desire at a knockdown price.

CNN: Counterfeiters zoom in on fake Ferraris