Mull- russian
куме́кать
to think, to ponder, to mull over
to understand, to get it, to know a thing or two, to know the ropes
обмозгова́ть
to think over, to mull over, to ponder, to figure out
маракова́ть
to have some notion, to know a bit (about), to have some idea
to ponder (over), to mull over, to rack one's brains
