Meaning of “refrain” - Learner’s Dictionary

refrain

noun [ C ] uk us /rɪˈfreɪn/
PHRASE/IDEA formal

a phrase or idea that you repeat often:

'Every vote counts' is a familiar refrain in politics.
SONG

a part of a song that you repeat

(Definition of “refrain noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)