knock on
To tap or hit a door to let people know you are there.
Meanings
To rap on a door or surface with the knuckles to attract attention or request entry.
"She knocked on the office door twice and waited for an answer before entering."
In the phrase 'knock on wood': to touch wood as a superstitious gesture to avoid bad luck after saying something optimistic.
"We've had no accidents this year — knock on wood."
Primarily literal. 'Knock on wood' (North American) or 'touch wood' (British) is a separate fixed phrase meant to ward off bad luck. The adjective 'knock-on' (as in 'knock-on effect') is derived from the same base and means an indirect consequence. Rugby also uses 'knock-on' as a technical foul.
Commonly used with
Forms
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Synonyms
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