on a first-come, first-served basis

idiom

Definition of on a first-come, first-served basis

: in the order of arrival of people or requests People are seated on a first-come, first-served basis. reservations are made on a first-come, first-served basis

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“On a first-come, first-served basis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20a%20first-come%2C%20first-served%20basis. Accessed 25 Feb. 2020.

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