one by one

逐一、逐次、個々、一人一人

one by one の類語

one at a time, one after another, individually, separately, severally, once, each, alone, particularly, apart, respectively, by itself, aside from, in two, per se, per capita, in the abstract, single-handedly, away from, in the singular, each to each, piecemeal, singly, in twain, independently, by the piece, apart from, apiece, singularly, asunder, per annum, on an individual basis, adrift

one by one の反意語

multiply

one by one の言い換えを探すには

one by one（逐一）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。