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English definition of “smudge”

smudge

noun [C]  /smʌdʒ/ us  
a mark left on a surface, usually unintentionally, from having touched something wet or sticky: Trev wiped a smudge of chocolate from the side of his mouth.

smudge

verb [T]  /smʌdʒ/ us  
to make a dirty, wet, or sticky mark on a surface: She was sweaty and her face was smudged with dirt. If you smudge something that is neat, you make it messy: She draws a line and then smudges it with her finger.
(Definition of smudge from the Cambridge Academic Content Dictionary © Cambridge University Press)
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