pencil someone in

 pencil someone in

= to schedule a time for someone to do something, but with the understanding that the plans are tentative and may change

Can I pencil you in for a meeting tomorrow? I will confirm the details later via WhatsApp.

I’ll pencil you in for the project meeting on Friday, but I’ll confirm closer to the date.

I can pencil you in for a training session next month, but I’ll need to check the schedule first.

Some synonyms and antonyms for "pencil someone in":

Synonyms

Tentatively schedule

Book a tentative appointment 

Set up a tentative time

Mark down (informally)

Antonyms

Confirm

Finalize

Schedule definitively

Set in stone 

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