to know about someone or something, but not know any details
to know that someone or something exists and who, what, or where they are
used for answering that you think something is not true, although you are not completely certain
Do you know of anyone who’s looking for a new car?
I only know of one case in which this has happened.
‘Has he asked for a meeting with the President?’ ‘Not that I know of.’
knows of
knowing of
knew of
known of
There is no origin for this phrasal verb
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