Akademik

Взялся за гуж, не говори, что не дюж
Once we have committed our selves to doing something, we must go through it whatever difficulties may arise and give it as much of our time and efforts as it requires. See Заварил кашу - не жалей масла (3)
Cf: Не that takes the devil into his boat must carry him over the sound (Am., Br.). In for a dime, in for a dollar (Am.). In for a mill, in for a million (Am.). In for a penny, in for a pound (Am., Br.). Once you pledge, don't hedge (Am.). You can't back out (Am., Br.)

Русско-английский словарь пословиц и поговорок. . 2013.