variants:
or first come, first serve
Definition of first come, first served
—used to say that the people who arrive earliest get served or treated before the people who arrive later The campsites are first come, first served, so we'd better get there early.The campsites are assigned on a first-come-first-serve basis."Aren't there any cookies left?" "Sorry—first come, first served."
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Merriam-Webster unabridged
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