<p><strong>Verb</strong></p><ul><li>(used with object) upset, upsetting:<ul><li>to overturn: to upset a pitcher of milk.</li><li>to disturb mentally or emotionally; perturb: The incident upset her.</li><li>Synonyms: fluster, disconcert, unnerve</li><li>Antonyms: steady</li><li>to disturb or derange completely; put out of order; throw into disorder: to upset a system; to upset a mechanism; to upset an apartment.</li><li>Antonyms: steady</li><li>to disturb physically: It upset his stomach.</li><li>to defeat or overthrow an opponent that is considered more formidable, as in war, politics, or sports.</li><li>Synonyms: displace, depose</li><li>Metalworking: to thicken the end of (a piece of heated metal) by hammering on the end against the length of the piece.</li></ul></li></ul><p><strong>Verb</strong></p><ul><li>(used without object) upset, upsetting:<ul><li>to become upset or overturned.</li></ul></li></ul><p><strong>Noun</strong></p><ul><li>an upsetting or instance of being upset; overturn; overthrow.</li><li>the defeat of a person, team, etc., that is considered more formidable.</li><li>a nervous, irritable state of mind.</li><li>Synonyms: disturbance, perturbation</li><li>a disordered or confused arrangement.</li><li>Synonyms: mess</li><li>Metalworking: a tool used for upsetting.</li><li>something that is upset, as a bar end.</li></ul><p><strong>Adjective</strong></p><ul><li>overturned: an upset milk pail.</li><li>disordered; disorganized: The house is upset.</li><li>distressed; disturbed: She had an upset stomach. He is emotionally upset.</li><li>Synonyms: annoyed, agitated, disconcerted</li><li>Archaic: raised up.</li></ul>