sweetheartn1 (dated 旧) one of a pair of lovers 恋人; 情人 They were childhood sweethearts. 他们原是青梅竹马的恋人. Mary has a sweetheart. 玛丽有个心上人.2 (used esp as a loving form of address, eg to a wife, husband, child, etc 尤用作爱称, 如称呼妻子、 丈 夫、 孩子等).
牛津英汉双解词典