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upsilon the name of the twentieth letter of the Greek alphabet. [2 definitions]
upstage toward or in the rear part of the stage. [6 definitions]
upstairs on or toward an upper floor; up the stairs. [4 definitions]
upstanding standing erect or vertical. [2 definitions]
upstart one who has an exaggerated esteem of himself or herself. [4 definitions]
upstate the part of a state that is north or inland of the major city or port. [2 definitions]
upstream toward or near the origin of a stream or river; against the current. [3 definitions]
upstroke an upward stroke, as of a piston or pen.
upsurge to rise or increase, esp. greatly, rapidly, or violently; surge up. [2 definitions]
upsweep to sweep, curve, or slope upwards. [4 definitions]
upswept sloping or curving upward.
upswing an upward part of a movement, as of a pendulum or cycle. [3 definitions]
upsy-daisy used to comfort or distract a baby as one raises it.
uptake a conduit or passage leading upward, such as a chimney or ventilation pipe. [2 definitions]
up the creek (informal) in trouble; in a difficult situation.
up the river (slang) in or to a prison.
upthrust a thrust in an upward direction.
uptight (informal) tense or nervous. [3 definitions]
up to busy with; doing. [3 definitions]
up-to-date having the most recent information; current. [2 definitions]
up to date fully informed.