at one time

一時、一時に、ある時、日外

at one time の類語

at a time, simultaneously, once, then and there, at once, all together, now, right away, all at once, formerly, time, together, as one, concurrently, without delay, at the same time, previously, erstwhile, pronto, forthwith, straightaway, in unison, erst

at one time の言い換えを探すには

at one time（一時）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。