Spyke

In my mind, I can't checkout, because it's a noun or an adjective. I always do verbs, so I check out.

12

Exactly. I also try only to do verbs, although occasionally I verb nouns.

Regardless, the counter you check out at is the checkout counter, while the counter you check in at is the check-in counter. So OP does still have a point.

4

It is, but it wasn't always.

Just like "today" was originally "to day" and then "to-day". People simplify stuff they use a lot.

5

Checkout is a noun. It's the registers at the end of the grocery store.

Checkin is also a noun. It means the front desk of a hotel.

Once you start verbing either of those, you need to split the words up. I don't know why, I don't make the rules.

1

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You can checkout, but you can never checkin. You will only ever check in, or check-in | Spyke