(archaic, chiefly law) Sexual intercourse.

A rounded protuberance, especially one arising from a flat surface; a fleshy lump or caruncle. / A rounded control switch that can be turned on its axis, designed to be operated by the fingers.

(Britain, slang, vulgar, of a man) To have sex with.

Resembling a knob. / Having many knobs or knob-like projections.

(colloquial, now US, rare) Knickerbockers. / (UK, New Zealand) Women's underpants.

A mild exclamation of annoyance.

An act of knocking down or the condition of being knocked down. / An overwhelming blow. / (slang, obsolete, uncountable) Very strong ale or beer.

(genetics) To employ the knockdown technique

powerful enough to overwhelm or knock down / reduced in price, originally to a price below which an article would not be sold by the auctioneer / Capable of being taken apart for packing or removal.

A small mound or rounded hill. / (oceanography) A rounded, underwater hill with a prominence of less than 1,000 metres, which does not breach the water's surface.