your good deed for the day

(one's) good deed for the day

Some especially good, kind, or generous thing one has done. Sometimes used ironically or sarcastically to suggest that a certain deed is not good or not as good as someone thinks. Wow, so you went all the way across town to deliver the missing wallet to its owner? That's your good deed for the day! It's like the guy thought he was doing his good deed for the day by pointing out my mistake to me.
See also: deed, good
Farlex Dictionary of Idioms.

your good deed for the ˈday

a helpful, kind thing that you do: Why don’t you do your good deed for the day and cook me dinner?
See also: deed, good
Farlex Partner Idioms Dictionary
See also:
  • (one's) good deed for the day
  • (one's) good deed of the day
  • deed
  • be good friends
  • be (just) good friends
  • do no good
  • be as good as new
  • be in good condition
  • (one) (has) never had it so good
  • for good measure
References in periodicals archive
So heed Paul's message - that way, you can enjoy a pint while doing your good deed for the day. A win-win if ever I heard one.
You'll have done your good deed for the day and might end up with interesting new mates.