every now and then

every now and then or every now and again or every so often or every once in a while  {adv. phr.}
At fairly regular intervals; fairly often; repeatedly.
John comes to visit me every now and then.
It was hot work, but every so often Susan would bring us something cold to drink.
Compare: NOW AND THEN.
Categories: adverb
Source: A Dictionary of American Idioms

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