that's big of you

that's big of you

That is noble or commendable of you to do. This phrase is often said sarcastically. Wow, you're actually going to spend time with your brother tonight? That's big of you. That's big of you to reconcile with people who have wronged you in the past.
See also: big, of
Farlex Dictionary of Idioms.

that's big of you

used as an ironic comment on the meagreness of someone's generosity.
See also: big, of
Farlex Partner Idioms Dictionary
See also:
  • be big of (one)
  • (one) will be lucky
  • (one) would be lucky
  • barrel of fun
  • bright idea
  • a bright idea
  • (one) should be so lucky
  • aforethought
  • are we having fun yet
  • Are we having fun yet?