What is "on edge"

Edge \Edge\ ([e^]j), n. [OE. eg, egge, AS. ecg; akin to OHG. ekka, G. ecke, Icel. & Sw. egg, Dan. eg, and to L. acies, Gr. 'akh` point, Skr. a[,c]ri edge. [root]

1. Cf. Egg, v. t., Eager, Ear spike of corn, Acute.] 1. The thin cutting side of the blade of an instrument; as, the edge of an ax, knife, sword, or scythe. Hence, (figuratively), that which cuts as an edge does, or wounds deeply, etc.

   He which hath the sharp sword with two edges.
   --Rev. ii. 1

2. Slander, Whose edge is sharper than the sword.
   --Shak.

   2. Any sharp terminating border; a margin; a brink; extreme verge; as, the edge of a table, a precipice.

   Upon the edge of yonder coppice.
   --Shak.

   In worst extremes, and on the perilous edge Of battle.
   --Milton.

   Pursue even to the very edge of destruction.
   --Sir W. Scott.

3. Sharpness; readiness or fitness to cut; keenness; intenseness of desire.

   The full edge of our indignation.
   --Sir W. Scott.

   Death and persecution lose all the ill that they can have, if we do not set an edge upon them by our fears and by our vices.
   --Jer. Taylor.

4. The border or part adjacent to the line of division; the beginning or early part; as, in the edge of evening. ``On the edge of winter.'' --Milton. Edge joint (Carp.), a joint formed by two edges making a corner. Edge mill, a crushing or grinding mill in which stones roll around on their edges, on a level circular bed; -- used for ore, and as an oil mill. Called also Chilian mill. Edge molding (Arch.), a molding whose section is made up of two curves meeting in an angle. Edge plane.

   1. (Carp.) A plane for edging boards.

   2. (Shoemaking) A plane for edging soles. Edge play, a kind of swordplay in which backswords or cutlasses are used, and the edge, rather than the point, is employed. Edge rail. (Railroad)

      1. A rail set on edge; -- applied to a rail of more depth than width.

      2. A guard rail by the side of the main rail at a switch. --Knight. Edge railway, a railway having the rails set on edge. Edge stone, a curbstone. Edge tool.

         1. Any tool or instrument having a sharp edge intended for cutting.

         2. A tool for forming or dressing an edge; an edging tool. To be on edge,

            1. to be eager, impatient, or anxious.

            2. to be irritable or nervous. on edge,

               1. See to be on edge.

               2. See to set the teeth on edge. To set the teeth on edge,

                  1. to cause a disagreeable tingling sensation in the teeth, as by bringing acids into contact with them. [archaic]
                     --Bacon.

                  2. to produce a disagreeable or unpleasant sensation; to annoy or repel; -- often used of sounds; as, the screeching of of the subway train wheels sets my teeth on edge.

a. (context idiomatic English) tense, nervous or irritable.

On Edge is an American alternative metal band from Arlington, Massachusetts, formed in 2013 by guitarist Tommy Barvick and drummer Jesse Schulz. Bassist Calvin McLean was recruited shortly after the band's inception, followed by the entrance of lead vocalist and rhythm guitar player Eric Sacarny.