| upset | (noun) an improbable and unexpected victory | Synonyms: overturn |
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| (noun) the act of disturbing the mind or body | Synonyms: derangement, overthrow |
| (noun) the act of upsetting something | Synonyms: overturn, turnover |
| (noun) a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging | Synonyms: swage |
| (noun) an unhappy and worried mental state | Synonyms: disturbance, perturbation |
| (noun) a physical condition in which there is a disturbance of normal functioning | Synonyms: disorder |
| upsetter | (noun) an unexpected winner; someone who defeats the favorite competitor | - |
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| upshot | (noun) a phenomenon that follows and is caused by some previous phenomenon | Synonyms: consequence, effect, event, issue, outcome, result |
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| upside | (noun) the highest or uppermost side of anything | Synonyms: top, top side, upper side |
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| upsilon | (noun) the 20th letter of the Greek alphabet | - |
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| upstage | (noun) the rear part of the stage | - |
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| upstager | (noun) a selfish actor who upstages the other actors | - |
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| upstairs | (noun) the part of a building above the ground floor | - |
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| upstart | (noun) a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright | Synonyms: kip |
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| (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: arriviste, nouveau-riche, parvenu |
| (noun) an arrogant or presumptuous person | - |
| upstroke | (noun) a stroke normally made in an upward direction | - |
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| upsurge | (noun) a sudden or abrupt strong increase | Synonyms: surge |
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| (noun) a sudden forceful flow | Synonyms: rush, spate, surge |