know what (one) is doing

(redirected from know what they are doing)

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
References in periodicals archive ?
After all, every deal, whether it is big or small, comes down to a few people, who either know what they are doing, or don't.
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