It is sort of like "Bear with me for a second." It would mean to keep listening while an idea is explained, or accept a premise while the explanation is happening. I'm pretty sure it starts with a p, and it's sort of like "patronize" but with less implicit skepticism. Thanks!
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to patiently allow (someone) to do or say something (Merriam-Webster)
PS: You threw me off with that p. Placate crossed my mind.
How about be patient with, which is another way to say bear with me?
From the Free Dictionary:
bear with someone/somebody: to be patient with someone or something [emphasis added]
Patient begins with a "p", and unlike "patronize me", bears no implicit skepticism.
"Be patient with me for a second" or "Please be patient with me for a second."