プログレッシブ和英中辞典(第３版)の解説
ほころびる【×綻びる】
I 〔縫い目が解ける〕come unsewn; 〔衣服が〕come apart at the seams
- このスーツは縫い目があちこちほころびた
Seams have 「popped open [come apart／come undone] here and there in this suit. - セーターのそで口がほころびかけた
The cuff of my sweater is raveling [unraveling].
II
1 〔つぼみが〕begin to open
- 桜がほころび始めた
The cherry blossoms have begun to bloom [open].／The cherry trees have started blooming.
2 〔顔などが〕smile
- 孫のかわいいしぐさに彼の顔は思わずほころんだ
He could not 「help smiling [repress a smile] at the innocent behavior of his grandchild.