Check your bags curbside

Hello,

I found an expression “check your bags curbside” and I wonder what part of speech curbside is.
Here’s an example:

When airport porters help you check your bags curbside , you should tip $2 for the first bag and $1 for each additional bag.

The phrase as it is hit over 4,000 results on Google. Dictionaries say that curbside is both a noun and an adjective, however, how it could be? Shouldn’t be an adverb here?

Thank you in advance,
sweetpumpkin

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I’m not a grammar expert ( far from it ), but I think this is used as an adverb. I think this is similar to “Check your bags there” or “walk over here”. I think both highlighted words are used as adverbs, modifying “check” and “walk”.

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