Knocking on a door is a common social convention used to signal one's presence and request entry into a private or semi-private space, such as a home, office, or room. It is typically performed by striking the door with one's knuckles or hand to produce an audible sound.
Knocking on a door is a common social convention used to signal one's presence and request entry into a private or semi-private space, such as a home, office, or room. It is typically performed by striking the door with one's knuckles or hand to produce an audible sound.
Source: Wikipedia "Knocking on doors" · CC BY-SA 4.0
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