v.
Pronunciation: ˌ ə p- ' end
Function: transitive verb
Date: 1823
1 : to set or stand on end also : OVERTURN 1
2 a : to affect to the point of being upset or flurried <a ⋯ literary shocker, designed to upend the credulous matrons ― Wolcott Gibbs> b : DEFEAT , BEAT
intransitive verb : to rise on an end