ㄖㄨㄛˋruòㄧㄡˇyǒuㄙㄨㄛˇsuǒshī

  1. 神情悵惘失落樣子南朝·劉義慶世說新語·德行》:不見鄙吝復生標注悵然若有所失。」紅樓夢·》:寶玉迷迷惑惑若有所失。」若有所喪」、若有所亡」。若無其事

as if one had lost something (idiom)​, to look or feel unsettled or distracted, to feel empty