Definition from macmillandictionary.com
Please fill in your name and address in the space provided.
I spent over two hours filling in the application form.
Fill in the missing words.
We know roughly how the system works, but Brian is here to fill in the blanks.
The canal is now disused and partly filled in.
Did Sam fill you in about the new project?
My secretary will fill you in on the details.
I’m filling in for the receptionist at the moment.