へんとうにこまる
返答に困る
to not know how to respond; to be at a loss for an answer; to be at a loss for words
N3Expression
Expression, Godan verb (ru ending)
to not know how to respond•to be at a loss for an answer•to be at a loss for words
to not know how to respond; to be at a loss for an answer; to be at a loss for words