- Main Entry:
- 1up·set

- Pronunciation:
-
\(ˌ)əp-ˈset\
- Function:
- transitive verb
- Inflected Form(s):
- up·set; up·set·ting
1: to trouble mentally or emotionally <the news upset me>2: to cause a physical disorder in; specifically : to make somewhat ill <greasy food upsets my stomach>