Idiom
one by one and one at a time
Theme: ARRANGEMENT
the first one, then the next one, then the next one, etc.; one at a time; 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.Fred peeled potatoes one by one, hating every minute of it.