to knock on a door

to obtain money, property, or value through force, threats, or blackmail; to rip someone off

to come to a decision or fix specific details such as a date or plan

to sound a warning or signal a critical situation, often used metaphorically

to strike or beat an object, such as a drum or a metal surface

to think over; to deliberate

extortion and blackmail

to strike keys on a keyboard or a musical instrument

the auditory signal produced by someone hitting a door with their hand or an object.

a means to an end; a temporary expedient such as a qualification or person used to achieve a goal and then discarded

to make indirect suggestions or hints, often with a hidden or derogatory meaning

to make a continual tapping or banging sound, often associated with manual work or repair

a deliberate show of strength as a warning

extortion by taking advantage of someone's weakness

to drive or insert something into an object by striking with a tool like a hammer.

to do things in bits and pieces; piecemeal work

Literally to strike the side or edge of a drum, often as a rhythmic accompaniment.

to do things in bits and pieces; piecemeal work

to toll a death knell

back-knocking massage

to open the door to or gain access to something figuratively, such as a market or opportunity

to be masturbated by a prostitute

to have sex with a prostitute

to make doubly sure (idiom)

of a clock, to strike or ring to indicate the time

to beat a gong

to incite trouble or exacerbate an existing dispute

to enter data into a computer or system using a keyboard

to receive oral sex from a prostitute

Having never done anything wrong or shameful, one does not need to fear unexpected visitors or sudden troubles.

(idiom) to quarrel (especially between family members)

to strike or tap something gently and lightly.

to press (fruit)

he who never wrongs others does not fear the knock in the night; one can rest easy with a clear conscience

(neologism, slang) to impatiently await

to strike or beat gongs and drums, often for celebration or performance