Definition of keyed up
informal
: in a state of nervous excitement
His hands were very sure. He was confident he could do the work, yet inside he was keyed up and jumpy.— Esther Forbes, Johnny Tremain, 1943 A friend called me, too keyed up to sleep.— Mike Nichols, Life and Other Ways, 1988
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Merriam-Webster unabridged
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Time Traveler for keyed up
The first known use of keyed up was in 1880
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