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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Words nearby one by one
one-armed bandit, on earth, on easy street, one-bagger, one-base hit, one by one, on edge, one-dimensional, one-down, one-eighty, one-eyed
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.