Definition of upend verb from the Oxford Advanced American Dictionary

 

upend

 verb
verb
NAmE//ʌpˈɛnd//
 
upend somebody/somethingVerb Forms present simple I / you / we / they upend
 
he / she / it upends
 
past simple upended
 
-ing form upending
 
 
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to turn someone or something upside down The bicycle lay upended in a ditch. They sat on upended wooden boxes.
See the Oxford Advanced Learner's Dictionary entry: upend