at a loss
https://gyazo.com/fc79337c8c555618844d3e26e65ade79
source: Are you stupid? ［Fate/Stay Night 2014］ : animegifs
at a loss
1. puzzled or uncertain what to think, say, or do:
〖be ～〗 «…するのに/…に» 困って, とまどって «to do/for» ; «…か» 途方にくれて «(as to)wh節･句»
e.g. with infinitive : she became popular, and was at a loss to know why
e.g. he was at a loss for words.: 彼はなんと言ってよいかわからなかった。
2. making less money than is spent buying, operating, or producing something:
〖文尾で〗赤字で, 損失を出して〈経営する･販売するなど〉
e.g. a railroad running at a loss.
#collocation