knock
n//nɑk//knackning, knacka, banka, slå emot, stöta emot
An abrupt rapping sound, as from an impact of a hard object against wood.
(intransitive) To rap one's knuckles against something, especially wood.
(transitive, Britain, slang, dated) To impress forcibly or strongly; to astonish; to move to admiration or applause.