閉口頓首（へいこうとんしゅ）
日文單字
意思：無言以對
English: being at a complete loss as to what to do; being at one's wit's end; being at a loss for an answer
日文單字
意思：無言以對
English: being at a complete loss as to what to do; being at one's wit's end; being at a loss for an answer