one by one   (TTS Sound)

The adv one by one has 3 senses

• one by one, one after another, one at a time -- (in single file; "the prisoners came out one by one")


• by the piece, one by one -- (one piece at a time; "she sold the plates by the piece")


• individually, separately, singly, severally, one by one, on an individual basis -- (apart from others; "taken individually, the rooms were, in fact, square"; "the fine points are treated singly")