paint in

paint in

To color or fill in some blank space with paint. A noun or pronoun can be used between "paint" and "in." I brought in a bunch of black-and-white pictures of cartoon characters for the kids to paint in. There's a big streak where the table scraped against the wall. I'll need to paint it in this weekend.
See also: paint
Farlex Dictionary of Idioms.

paint something in

to paint something extra onto a painted area. I know that there is supposed to be a big white spot here. We will have to paint it in. We will have to paint in the spot.
See also: paint
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • paint out
  • paint over
  • change back
  • paint on
  • paint onto
  • paint (something) onto (something)
  • watch
  • in (one's) opinion
  • in opinion
  • not do much for (someone)