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1.
not relaxed, nervous, anxious, edgy
Gina's a little on edge. She gets her test results back today.
by VAKI5 May 09, 2005
 
2.
In construction, used to define the position of any item where the long edge is perpendicular to the ground.
Place the board on edge and toenail it to the floor.
by James Aaron October 28, 2006