on edge

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a. A thin, sharpened side, as of the blade of a cutting instrument.
b. The degree of sharpness of a cutting blade.
c. A penetrating, incisive quality: "His simplicity sets off the satire, and gives it a finer edge" (William Hazlitt).
d. A slight but noticeable sharpness, harshness, or discomforting quality: His voice had an edge to it.
e. Keenness, as of desire or enjoyment; zest: The brisk walk gave an edge to my appetite.
a. The line or area farthest away from the middle: lifted the carpet's edge. See Synonyms at border.
b. The line of intersection of two surfaces: the edge of a brick.
c. A rim or brink: the edge of a cliff.
d. The point at which something is likely to begin: on the edge of war.
3. A margin of superiority; an advantage: a slight edge over the opposition.
v. edged, edg·ing, edg·es
a. To give an edge to (a blade); sharpen.
b. To tilt (a ski or both skis) in such a way that an edge or both edges bite into the snow.
a. To put a border or edge on: edged the quilt with embroidery.
b. To act as or be an edge of: bushes that edged the garden path.
3. To advance or push slightly or gradually: The dog edged the ball with its nose.
4. To trim or shape the edge of: edge a lawn.
5. To surpass or beat by a small margin. Often used with out: The runner edged her opponent out at the last moment.
To move gradually or hesitantly: The child edged toward the door.
on edge
Highly tense or nervous; irritable.
on the edge
1. In a precarious position.
2. In a state of keen excitement, as from danger or risk: "the excitement of combat, of living on the edge" (Nelson DeMille).

[Middle English egge, from Old English ecg; see ak- in Indo-European roots.]

edge′less adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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(edʒ) noun
1. the part farthest from the middle of something; a border. Don't put that cup so near the edge of the table – it will fall off; the edge of the lake; the water's edge.
2. the cutting side of something sharp, eg a knife or weapon. the edge of the sword.
3. keenness; sharpness. The chocolate took the edge off his hunger.
1. to form a border to. a handkerchief edged with lace.
2. to move or push little by little. He edged his chair nearer to her; She edged her way through the crowd.
ˈedging noun
a border or fringe round a garment. gold edging.
ˈedgy adjective
irritable. That actress is always edgy before a performance.
ˈedgily adverb
ˈedginess noun
have the edge on/over
to have an advantage over. he had the edge over his opponent.
on edge
uneasy; nervous. She was on edge when waiting for her exam results.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.