выполнятьдо конца — to follow out
быть честным до конца — to be perfectly honest
до конца ногтей — to the / one's fingertips
до конца (своих) дней — to one's dying day
конец делу венец — the end crowns the work
с концами — that was the end of him
у него концы с концами не сходятся — he can barely keep his head above water, he can barely make ends meet; it doesn't add up, there are a lot of loose ends; the accounts do not balance out, it doesn't add up
он отдал концы — he kicked off, he cashed in (his chips)