Definitions
There are 3 meanings of the phrase
One By One.
One By One - as an adverb
One piece at a time
Example: "She sold the plates by the piece"
Synonyms (Exact Relations)
by the pieceApart from others
Example: "Taken individually, the rooms were, in fact, square"
Synonyms (Exact Relations)
individuallyon an individual basisseparatelyseverallysinglyExample Sentences
"The students entered the room one by one."
"She picked up the books from the floor one by one."
"The guests were announced one by one."
"He sorted the letters into piles one by one."
"The pieces of the puzzle were put together one by one."