A knock-knock joke

(colloquial, often childish) A phrase used to introduce a "knock knock joke" / (colloquial, often childish) A phrase used in lieu of knocking (e.g. on the door), when it is not possible to knock.

(idiomatic) To impress greatly; amaze; stun.

(colloquial, chiefly imperative, idiomatic) To cease doing something, particulary annoying or unpleasant; to desist.

Cease doing something, particularly annoying or unpleasant; desist.

To bump or strike something in such a way as to tip it / (slang) To rob; to stage a heist of.

Alternative form of knockoff

(intransitive, slang) To halt one's work or other activity. / (transitive, slang) To kill. / (sports, by extension) To defeat. / (transitive) To remove, as a discount or estimate.

(transitive) To strike or bump (someone or something) out. / (transitive, idiomatic) To render unconscious, as by a blow to the head. / (transitive, idiomatic) To put to sleep.

The act of making one unconscious, or at least unable to come back on one's feet within a certain period of time; a TKO. / The deactivation of anything.