青梅枯萎
[qīng méi kū wĕi]
This translates literally as 'dried up green plum (unripened plum)', metaphorically describing withered or ended childhood sweethearts, implying that what was once innocent, fresh love has faded over time. Similar usage exists also within 'green melon falling from vine (两小无猜, young lovers playing together)', signifying lost innocence or romance that fades into oblivion eventually.