the.com/upset
The emotional state where your stomach files a complaint your face quietly delivers.
means To feel unhappy, disturbed, or distressed, or to overturn a plan, object, or expectation.
from From Middle English, literally to set up — which once meant to erect, then flipped to mean knocking the whole thing over instead.
Sports senseAn underdog toppling a favorite is an upset.
Old meaningOriginally meant to set upright, not overturn.
Stomach editionUpset stomach borrows the overturned imagery literally.