Longman Dictionary of Contemporary English homepage

on-off

 adjective
     
on-off [only before noun]
1 happening sometimes and not at other times:
an on-off relationship
She had an on-off obsession with Mikey.
2 an on-off switch is the thing you press to make a piece of electrical equipment start and stop working
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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