| upstate | (adverb) in or toward the northern parts of a state | - |
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| upstream | (adjective) in the direction against a stream's current | - |
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| (adverb) toward the source or against the current | Synonyms: upriver |
| 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 |
| whipsaw | (noun) a saw with handles at both ends; intended for use by two people | Synonyms: lumberman's saw, two-handed saw, two-man saw |
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| (verb) saw with a whipsaw | - |
| (verb) victimize, especially in gambling or negotiations | - |
| whipsnake | (noun) any of several small fast-moving snakes with long whiplike tails | Synonyms: whip-snake, whip snake |
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| whipstitch | (noun) a sewing stitch passing over an edge diagonally | Synonyms: whipping, whipstitching |
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| whipstitching | (noun) a sewing stitch passing over an edge diagonally | Synonyms: whipping, whipstitch |
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| xanthopsia | (noun) visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice | - |
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| yips | (noun) nervous tension that causes an athlete to fail (especially causes golfers to miss short putts) | - |
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| zoopsia | (noun) visual hallucination of animals; sometimes occurring in delirium tremens | - |
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