one by one


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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 shoolhouse to begin their lesson. The usher asked the theater patrons to exit the theater one by one.
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one by one

 and one at a time
the first one, then the next one, then the next one, etc.; each in turn. I have to deal with problems one by one. I can't handle them all at once. Okay, just take things one at a time. The children came into the room one by one.
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one by one

one person or thing following another in order The children filed out of the bus, one by one.
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one by one

Also, one at a time. Individually in succession, as in The ducklings jumped into the pond one by one, or One at a time they went into the office. Formerly also put as one and one and one after one, this idiom dates from about a.d. 1000.
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one by one

Individually in succession.
See also: one