A knowledge of how to make something work without deeper theoretical understanding of why it works.

Someone who works with information or data.

Having knowledge, especially of a particular subject. / Educated and well informed.

(India) A person who has knowledge; an informed party.

(idiomatic) To go ahead; to do as one pleases.

(idiomatic, ironic) Don't overexert yourself (in doing something that does not require much effort).

(transitive, simile) To be intimately knowledgeable about something.

A leather scourge (multi-tail whip), in the severe version known as 'great knout' with metal weights on each tongue, notoriously used in imperial Russia.

To flog or beat with a knout.

(idiomatic, US) To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement.