knock under (to someone or something)

knock under (to someone or something)

obsolete To submit, yield, or surrender (to someone or something). The king was left with no choice but to knock under to the invading empire. The band of rebels was vastly outnumbered, but they refused to knock under. This is the law. The sooner you knock under to that, the better.
See also: knock, someone
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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