According to Wiktionary

来源: 于 2013-08-04 17:48:23 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Wiktionary:

Verb[edit]

upend (third-person singular simple present upends, present participle upending, simple past and past participle upended)

  1. (transitive) To end up; to set on end.
  2. To tip or turn over.  
  3. To destroy, invalidate, overthrow, or defeat.