day in and day out
day in and day out or day in, day out {adv. phr.}
Regularly; consistently; all the time; always.
He plays good tennis day in and day out.
- Also used with several other time words in place of day: week, month, year.
Every summer, year in, year out, the ice cream man comes back to the park.
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Source: A Dictionary of American Idioms
