one at a time


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Related to one at a time: One Step at a Time

one at a time

In individual succession, with each person or thing following another in order. The children walked silently one at a time into the schoolhouse to begin their lesson. Ladies and gentlemen, please exit the theater one at a time!
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one by one

In individual succession, with each person or thing following another in order. The children walked silently, one by one, into the schoolhouse to begin their lesson. The usher asked the theater patrons to exit the theater one by one.
See also: one