adverb
occurring irregularly or intermittently
preposition
indicating sporadic or intermittent action or behavior
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The project has been progressing slowly, with work being done off and on.
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I've been watching the show off and on, but I can't seem to get into it.
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I've been texting him off and on, trying to figure out our plans for tonight.
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Her interest in the hobby comes and goes, like a light switch being turned off and on.