Note. 類似說法: It slipped my memory; I (total) forgot.
Note. 類似說法: What's done is done; What's done cannot be undone.
Note. 類似說法: Don't draw attention to yourself; Keep yourself in the background
Note. 動詞 "work up" 有 "激起 (熱情)" 之意, 後面常接 enthusiasm, interest, courage 等名詞.
類似說法有: I couldn't get excited about it; I couldn't get pumped up about it.