Wiktionary
vb. (en-third-person singular of: fill in)
Usage examples of "fills in".
And you don't notice that words have changed on another part of the page because your mind fills in a picture of things you're not looking at at that moment.
I'm under orders from Illyan to maintain a bodyguard at all times, so Commander Quinn fills in whenever I have to change identities.
Andrew Loeb takes another step forward and plants his wizard's staff, which suddenly flies into the air like a rocket, leaving a steaming crater behind in the water, which instantly fills in, of course.
Each novel fills in pieces of the history of this land where Chaos and Order strive to maintain a magical balance.
Ellindyja does not look up, as the unsteady needle slowly fills in the second lobe of the coronet she stitches.