собаку съесть
собаку съесть (на чем-л.) {informal} {v. phr.} {perf.}
{literally} to eat a dog
To gain experience in sth. To be very experienced.
~ cut one's teeth on — ~ набивать шишки.
Он на этом деле съел собаку. — He has cut his teeth on (is very experienced in) this kind of tasks business./
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