Literal sense: a seam bursting. 破绽 is a split seam, used figuratively for a flaw or giveaway in an argument or scheme. The bright sense is 绽放 (to burst into bloom), as a bud splits open.
Left silk radical, the side-form of 糸. The original image is a thread or stitched seam giving way, which then extends to a flower bud bursting open. Same thread family as 线 and 缝.
