on the lookout

on the lookout の類語

custodial, all ears, on guard, hawk eyed, sharp eyed, keen-eyed, with open eyes, on the watch, eagle-eyed, observant, watchful, argus-eyed, vigilant, sharp-eyed, lidless, hawk-eyed, wary, prudent, sleepless, guarded, all eyes, open eyed, open-eyed, alert, mindful

on the lookout の言い換えを探すには

on the lookout（）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。