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Discover LudwigThe phrase "pencil in" is correct and usable in written English.
You can use it to describe making a tentative arrangement or appointment, usually by writing it in an informal or temporary manner such as in a diary or on a calendar. For example, "I'll pencil in a meeting next week to discuss the project."
Dictionary
pencil in
verb
To fill in using pencil
Exact(57)
Pencil in China for 2030.
"So true," you pencil in the margins.
I have no pencil in hand.
He stood and watched her, pencil in hand.
Wagnerites should pencil in a weekend this summer at Bard.
So I wouldn't just pencil in a draw.
Pencil in hand, 19-year-old Chandra did some calculations.
In pencil, in one corner, was the notation: "Won't work".
Similar(3)
But the pencil-in-the-hair-bun is fairly straightforward.
Pencil-in the costumed interpreter tour about 18th century tavern life on your must-do list.
Pencil-in-cup and gross osteolysis deformities.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com