first come first served
—used to imply that those who arrive first receive services or attention before those who arrive later. First come, first served applies to the campsites, so we’d better arrive early. First-come, first-served policy applies to the allocation of campsites.
first come first serve basis
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Log In First-come, first-served definition: according to the arrival of individuals or requests
On a first-come, first-served basis, people are seated.
First-come, first-served policy applies to reservations.