The Collaborative International Dictionary of English v.0.48:
Pinch \Pinch\, n.
1. A close compression, as with the ends of the fingers, or
with an instrument; a nip.
2. As much as may be taken between the finger and thumb; any
very small quantity; as, a pinch of snuff.
3. Pian; pang. "Necessary's sharp pinch." --Shak.
4. A lever having a projection at one end, acting as a
fulcrum, -- used chiefly to roll heavy wheels, etc. Called
also pinch bar.
At a pinch, On a pinch, in an emergency; as, he could on
a pinch read a little Latin.