know what (one) is doing

To be adequately prepared or knowledgeable enough to do something. You really shouldn't be handling those power tools unless you know what you're doing.

See also: know, what

See also:

know what (one) is talking about
know what you're talking about
write the book on
wrote the book on
wrote the book on (something)
get a/the feel of (something)
get the feel of
get the feel of something
get with
get with it

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