be (all) for (someone or something)

be (all) for (someone or something)

To support or be in favor of a person, group, or effort. If management is considering adding a gym to the building, I'm all for it! I respect your opinion, but I'm for the other candidate. I don't know about the rest of you, but I'm all for going on a hike!
Farlex Dictionary of Idioms.

be for someone or something

 and be for doing something
supporting or in favor of someone or something. I'm for abandoning the scheme. Mary is running for office, and the whole family is for her.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

be for it

be in imminent danger of punishment or other trouble. British informal
1997 Peter Carey Jack Maggs The master. He reads to me. He would be reading to me now but I said I was ill and must go back to my bed. I'm for it if he finds me gone.
Farlex Partner Idioms Dictionary

be all for something/for doing something

believe strongly that something should be done: They’re all for saving money where they can. OPPOSITE: be (dead) set against something/against doing something
See also: all, something
Farlex Partner Idioms Dictionary

be for

v.
To be in favor of something or someone: I'm definitely not for cutting down the trees; we need the shade. Are you for these candidates, or against them?
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • be for
  • be for it
  • be all for something/for doing something
  • go one-on-one with (someone)
  • gym shoe
  • masse
  • be a fine figure of a (man or woman)
  • en
  • en masse
  • be all very well