綻 means “come apart, fray, bloom”

ほころびる · hokorobiru

Also: be rent, ripped, unravel, run

Kun'yomi (Japanese reading)
ほころびる
On'yomi (Chinese reading)
タン

JLPT N1 · Taught in secondary school · 14 strokes

The story

Threads (糸) once settled (定) coming loose: a seam splitting open. 綻びる is to fray, 綻ぶ is a bud bursting open or a face breaking into a smile, and 破綻 is a collapse, the news word for a failed bank or marriage.

Used in 綻びる (hokorobiru, to come apart at the seams), 綻ぶ (hokorobu, to begin to bloom/smile), and 破綻 (hatan, collapse/failure)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.