kəlləni ağartmaq
1. to turn grey
шутл. поседеть;
2. he knows all there is to know about that / he knows the subject inside out / he has no match in smth. / he is a past master at smth. / Cf. he has at his finger-ends (finger-tips) / he knows his onions / he is master at smth.
собаку съел на чём / в чём (приобрёл большой опыт, навык, прекрасно разбирается)