n.
Pronunciation: ' ə p- ˌ set
Function: noun
Date: 1804
1 : an act of overturning : OVERTURN
2 a (1) : an act of throwing into disorder : DERANGEMENT (2) : a state of disorder : CONFUSION b : an unexpected defeat
3 a : a minor physical disorder <a stomach upset > b : an emotional disturbance <went through a big upset after his father's death>
4 a : a part of a rod (as the head on a bolt) that is upset b : the expansion of a bullet on striking