filling in

Verb

fill in (third-person singular simple present fills in, present participle filling in, simple past and past participle filled in)

1. (idiomatic, transitive) To fill; to replace material that is absent or has been removed.
   • After you're done laying the pipe, fill in the trench.
2. (idiomatic, transitive) To inform somebody, especially to supply someone missing or missed information.
   • If you know anything about this, maybe you can fill me in.
3. (idiomatic, intransitive) To substitute for somebody or something.
   • He can't go on vacation very often because there is nobody to fill in for him.
4. (UK, idiomatic, transitive) To complete a form or questionnaire with requested information.
   • I've got a form that is to be filled in in ink.

   Synonyms:

   fill out

5. (idiomatic, slang) To beat up; to physically assault.
   • Talk to me like that again and I'll fill you in!