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The Collaborative International Dictionary
On a pinch

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.

Wiktionary
on a pinch

adv. (archaic form of at a pinch English)

Usage examples of "on a pinch".

I went and got Katz and brought him back with me, pulling on a pinch of shirtsleeve.