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English definition of “on and off”

on and off

(also off and on)
C1 If something happens on and off during a period of time , it happens sometimes: I've had toothache on and off for a couple of months .Frequency and regularity - general words Grammar:On, ontoOn and onto are prepositions.
(Definition of on and off from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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