Meaning of “day in day out” in the English Dictionary

british dictionary

"day in day out" in British English

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day in day out

(especially of something boring) done or happening every day for a long period of time:

I have to do the same boring jobs day in day out.

(Definition of “day in day out” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"day in, day out" in American English

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day in, day out

also day in and day out

every day:

I do the same things day in, day out.
Note: Used to say that a repeated event or task is boring.

(Definition of “day in, day out” from the Cambridge Academic Content Dictionary © Cambridge University Press)