knuckle under

verb

knuckle under

verb

1

Idiomatic To cooperate or yield when forced or pressured to do so.

The man is a ruffian. I won't knuckle under to him!1907, John Galsworthy, “Acute Attack of—‘Pendycitis’”, in The Country House, London: William Heinemann, →OCLC, part III, page 286:

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