Definition of bumble verb from the Oxford Advanced Learner's Dictionary

 

bumble

 verb
verb
BrE BrE//ˈbʌmbl//
 
; NAmE NAmE//ˈbʌmbl//
 
Verb Forms present simple I / you / we / they bumble
BrE BrE//ˈbʌmbl//
 
; NAmE NAmE//ˈbʌmbl//
 
he / she / it bumbles
BrE BrE//ˈbʌmblz//
 
; NAmE NAmE//ˈbʌmblz//
 
past simple bumbled
BrE BrE//ˈbʌmbld//
 
; NAmE NAmE//ˈbʌmbld//
 
past participle bumbled
BrE BrE//ˈbʌmbld//
 
; NAmE NAmE//ˈbʌmbld//
 
-ing form bumbling
BrE BrE//ˈbʌmblɪŋ//
 
; NAmE NAmE//ˈbʌmblɪŋ//
 
 
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[intransitive] + adv./prep. to act or move in an awkward or confused way I could hear him bumbling around in the kitchen. Word Origin late Middle English (in the sense ‘hum, drone’): from boom ‘a loud sound’ + -le.
See the Oxford Advanced American Dictionary entry: bumble