Definition of bunch verb from the Oxford Advanced American Dictionary

 

bunch

 verb
verb
NAmE//bʌntʃ//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they bunch
 
he / she / it bunches
 
past simple bunched
 
-ing form bunching
 
 
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to become tight or to form tight folds; to make something do this His muscles bunched under his shirt. bunch (something) up Her skirt had bunched up around her waist. bunch something His forehead was bunched in a frown. Phrasal Verbsbunch up/together
See the Oxford Advanced Learner's Dictionary entry: bunch