"Knock" Natural Recordings by Native Speakers
to strike or hit something gently and briefly, typically with the hand, in order to test or signal: He knocked on the door to see if anyone was home.
or
to bring something or someone down gently, especially by a short but sudden blow: The pirates knocked the rival ship off course.
or
to have a particular sound, especially a sharp, hollow, or ringing one, when something is hit or struck: The knock of the door was loud and insistent.
or
to stop or close by a single blow or movement: She knocked the cigarette out of his hand.
or
to cause something to become or go into a particular state: The cold knock the wind out of him.
or
to stop or discontinue something suddenly: The knock has knocked the business upside down.
It is also used to mean to realize or understand something:
When I saw the news, it knocked to realize that my best friend was dead.
A knob is a small handle or protrusion on a device or mechanism that is turned or rotated to operate or adjust it.
Knock-down describes something that is easily broken or destroyed, often in a violent or sudden manner. For example, an argument can get out of hand and knock down a previously good relationship. It can also refer to something that can be easily taken down or toppled, such as a billboard or a stand. In construction, a knock-down is a type of joint used to join two pieces of molding or wood together, where one piece is slightly tapered to fit into the other, creating a strong and durable bond.
Knock-kneed is a phrase that describes a physical characteristic where the knees are bent or inclined inward, giving the appearance that the legs are cramped or bow-legged.
Knockabout is a noun that refers to a rough or rowdy person or a person who is reckless and irresponsible. It can also describe a type of informal or unrealistic comedy, often featuring slapstick humor and chaotic situations.