Definition of yarn bombing noun from the Oxford Advanced Learner's Dictionary

 

yarn bombing

 noun
noun
BrE BrE//ˈjɑːn bɒmɪŋ//
 
; NAmE NAmE//ˈjɑːrn bɑːmɪŋ//
 
(also yarn storming
BrE BrE//ˈjɑːn stɔːmɪŋ//
 
; NAmE NAmE//ˈjɑːrn stɔːrmɪŋ//
 
)
[uncountable](informal)
 
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a type of art in which people decorate items in the streets with colourful pieces of knitting or other items made using wool, cotton, etc., often doing it secretly Yarn bombing is another recent form of graffiti.