Meaning of “jot sth down” - Learner’s Dictionary

jot sth down

phrasal verb with jot us uk /dʒɒt/ verb [ T ] present participle jotting, past tense and past participle jotted

to write something quickly on a piece of paper so that you remember it:

I jotted down / some notes during his speech.

(Definition of “jot sth down” from the Cambridge Learner’s Dictionary © Cambridge University Press)