intransitive. To strike with a sounding blow, as with the fist or something hard; esp. to rap upon a door or gate in order to call attention or…

intransitive and absol. To strike a light but distinct blow; to make a sound by so striking, e.g. on a drum; esp. to knock lightly on or at a door…

intransitive. To strike a hard surface (esp. a door) sharply, and often rapidly in succession; to make a sharp knocking or banging sound. Frequently…

intransitive. To strike; modern Scottish chap.

absol. or intransitive.

intransitive. To deal (sharp sounding) blows. Obsolete. Cf. knack, n.1 1.

intransitive. To knock, rap, at a door.