Definition of On edge

Babylon English Dictionary
pressured, tense, hurrying, on needles and pins
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On edge Definition from Language, Idioms & Slang Dictionaries & Glossaries
ENGLISH IDIOMS 2.EDITION
be nervous or irritable He has really been on edge lately because of his exams.
English Idioms WM 1.3a
not relaxed, nervous, anxious, edgy 
Gina's a little on edge. She gets her test results back today.
On edge Definition from Entertainment & Music Dictionaries & Glossaries
american horse racing dictionary
A nervous horse; a sharply conditioned horse