the.com/splotch

A stain that gave up on having edges.

means A large, irregularly shaped blot or smear — bigger and blobbier than a plain spot.

from Likely a blend coinage, probably fusing 'spot' or 'blot' with 'botch,' from around the 1600s. English loves mashing together two messy words to make an even messier one — 'splotch' sits in a family with 'splat,' 'blotch,' and 'splodge,' all born from that same squelchy, consonant-heavy instinct to make a word sound like the mess it describes.

vs blotch
splotch implies bigger, messier, less sorry about it
origin
blend of splash and blot, 1880s
shape rule
irregular by definition, symmetry voids the word
usage
ink, paint, ketchup — never anything tidy
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