プログレッシブ和英中辞典(第4版)の解説
おもいあがり【思い上がり】
礼状も電話も寄越さないとは，あの男の思い上がりもはなはだしい
「What conceit! [How arrogant!] He didn't so much as send a thank-you note or even telephone!
彼女が君に夢中だって．思い上がりだよ
You think she's in love with you? You have a pretty good opinion of yourself, don't you!