pinch(redirected from at a pinch)
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Related to at a pinch: get to the bottom of, take a stab at something
1. the quantity of a substance, such as salt, that can be taken between a thumb and finger
2. a very small quantity
The closing-in of borehole walls before casing is emplaced, resulting from rock failure when drilling in formations having a low compressional strength.
Thinning of a rock layer, as where a vein narrows.