A loose or opened seam; a tear where fabric or stitching has come apart. Also used figuratively for small flaws or cracks in things or relationships.
古いコートの袖に綻びが見つかったので、仕立て直してもらった。
I found a tear on the sleeve of my old coat, so I had it restitched.
プロジェクトの計画に綻びが生じ、納期に間に合わなくなった。
A flaw appeared in the project's plan, and we couldn't meet the deadline.
彼の笑顔には少し綻びがあって、疲れがうかがえた。
There was a slight slackness in his smile, suggesting he was tired.