ink in
Upper Intermediate (B2)neutral
To go over a pencil drawing with ink, or to set a plan in stone.
"She penciled in the figures first, then carefully inked them in."
Hear it in context

If you see this thumbnail, you've reached the Creed-trix
The Office · 8:08
but um all the ink in the printer was gone.

What's the Point of Prototyping?
Game Maker's Toolkit · 2:30
Whether its splatting ink in Splatoon or making vehicles in Tears

Art of Handwriting! - Live in the Nutmeg Tavern
Townsends · 55:39
Even that little bottle there may have had ink in it.

Alan Turing’s Final Theory Was About Leopards
The Rest Is Science · 5:45
and I'm going to put a drop of ink in there.

101 Biology Facts, Slowly Explained | Science for Sleep
The Sleepy Scientist · 182:29
Put ink in a tank of corn syrup and stir, then unstir,