ONCE AND FOR ALL

{adv. phr.} 1. One time and never again; without any doubt; surely; certainly; definitely. * /Let me say, for once and for all, you may not go to the party Saturday./ * /For once and for all, I will not go swimming with you./ 2. Permanently. * /Bill and Tom asked the teacher to settle the argument once and for all./ * /The general decided that two bombs would destroy the enemy and end the war once and for all./