to be very familiar with something; to have a thorough understanding of something
очень хорошо разбираться в чем-либо; иметь глубокое понимание чего-либо (ochen khorosho razbiratsya v chem-libo; imet glubokoe ponimanie chego-libo)
"He really knows the ropes in this field of work."
"Он действительно знает все тонкости в этой сфере работы" (on deystvitelno znaet vse tonkosti v etoy sfere raboty)
to be in a position of leadership or power
a characteristic that many members of a family share
very close to death
to adapt and learn quickly without prior preparation
something that reminds you of an earlier time
to work at a second job, especially secretly or part-time
