pinch

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pinch

1. the quantity of a substance, such as salt, that can be taken between a thumb and finger
2. a very small quantity

pinch

[pinch]
(engineering)
The closing-in of borehole walls before casing is emplaced, resulting from rock failure when drilling in formations having a low compressional strength.
(geology)
Thinning of a rock layer, as where a vein narrows.
(mining engineering)