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I work like a dog day in and day out. day-in and day-out? day in, and day out? , day in and day out? Please advise.

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up vote 4 down vote accepted

According to NOAD you can leave out the and and drop the hyphens:

day in, day out
continuously or repeatedly over a long period of time.

So maybe:

Day in, day out, I work like a dog.

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I work like a dog, day-in and day-out.

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In standard British English, you just write "day in day out". In standard American English, you write "day in, day out" or "day in and they out". (http://dictionary.cambridge.org/dictionary/english/day-in-day-out)

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Typo there: "day in and they out." – Maverick Oct 16 '15 at 18:26

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