Completely in favor of something or someone, as in I'm all for eating before we leave, or The players are all for the new soccer coach. This colloquial phrase was first recorded in 1864.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use all for in a sentence
All they knew was that it was a purely love match, very unusual in those all-for-money-days.Zoe; Or, Some Day | May Leonard
This some-may-be-all-for-aught-we-say, or not-none, is the logician's some.A Budget of Paradoxes, Volume I (of II) | Augustus De Morgan
I wish you were married to one of the all-for-love heroines, who would treat you with bowl and dagger every day of your life.Tales And Novels, Volume 8 (of 10) | Maria Edgeworth