She is my one and only. 我向女友求婚是因为我知道自己想和她共度余生。 她是我唯一心爱的人。 That's so cute that you told him he was your one and only. You two make an amazing couple. 你告诉他说他是你生命中的唯一，真是太好了！ 你们俩是天生一对。

And it can be used in a range of tenses, like the continuous 'one-upping', and the past simple 'one-upped'. Jiaying 是的，人们常用 “one-up” 来向他人炫耀 “在一件事情上比他人表现得更好”，带有调侃的意味。 “One-up” 的后面常直接加表示人的词语。