Here's the definition from Wiktionary

来源: 冲浪潜水员 于 2012-02-16 08:15:04 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (961 bytes)
回答: 【冲浪英语】 Random Thoughts 21 由 冲浪潜水员 于 2012-02-15 09:43:20

[Note: the following is from wiktionary, not my imagination.]

Noun

sweetheart (plural sweethearts)

  1. A person who is always very kind.
    She is such a sweetheart, she never complains about my being late.
  2. A person very much liked or loved by someone, especially when both partners are young.
    John married his highschool sweetheart in 1981.
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