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

 

blunder

 verb
verb
BrE BrE//ˈblʌndə(r)//
 
; NAmE NAmE//ˈblʌndər//
 
Verb Forms present simple I / you / we / they blunder
BrE BrE//ˈblʌndə(r)//
 
; NAmE NAmE//ˈblʌndər//
 
he / she / it blunders
BrE BrE//ˈblʌndəz//
 
; NAmE NAmE//ˈblʌndərz//
 
past simple blundered
BrE BrE//ˈblʌndəd//
 
; NAmE NAmE//ˈblʌndərd//
 
past participle blundered
BrE BrE//ˈblʌndəd//
 
; NAmE NAmE//ˈblʌndərd//
 
-ing form blundering
BrE BrE//ˈblʌndərɪŋ//
 
; NAmE NAmE//ˈblʌndərɪŋ//
 
 
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[intransitive] to make a stupid or careless mistake The government had blundered in its handling of the affair. Word Origin Middle English: probably of Scandinavian origin and related to blind. Phrasal Verbsblunder about, around, etc.blunder into somethingblunder on
See the Oxford Advanced American Dictionary entry: blunder