Definition of upset

• v. t. - To set up; to put upright.
• v. t. - To thicken and shorten, as a heated piece of iron, by hammering on the end.
• v. t. - To shorten (a tire) in the process of resetting, originally by cutting it and hammering on the ends.
• v. t. - To overturn, overthrow, or overset; as, to upset a carriage; to upset an argument.
• v. t. - To disturb the self-possession of; to disorder the nerves of; to make ill; as, the fright upset her.
• v. i. - To become upset.
• a. - Set up; fixed; determined; -- used chiefly or only in the phrase upset price; that is, the price fixed upon as the minimum for property offered in a public sale, or, in an auction, the price at which property is set up or started by the auctioneer, and the lowest price at which it will be sold.
• n. - The act of upsetting, or the state of being upset; an overturn; as, the wagon had an upset.