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Check in vs. check-in (vs. checkin)

Check-in is hyphenated when it’s a noun (e.g., I was early for check-in) or an adjective (I walked up to the check-in counter). It’s two words, unhyphenated, when it functions as a verb (I walked up to the counter to check in).


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Checkin has yet to gain acceptance (whereas checkoutcheckup, and many similar one-word compounds have), perhaps because it looks too much like chicken.

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