key up
To be energetic and excited, possibly with nerves. A noun or pronoun can be used between "key" and "up." It's Christmas Eve, and the kids are totally keyed up. Waiting for the doctor to call with my test results has really keyed me up.
keyed up
Excited, nervous, or anxious. I'm so keyed up after that concert that there's no way I'm going to be able to fall asleep. Ben gets a little keyed up before he goes on stage, but once he's out there, he's completely in control.
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