Aqui está a definição do Webster's. Aplica-se a de número 2:

shears (sirz)
n.pl.
1 a pair of scissors, usually large, as used in gardening: also called pair of shears
2 any of several large tools or machines used to cut metal, etc. by the scissors action of two opposed cutting edges
3 a device used in hoisting, consisting of two or more guyed poles or legs spread at the base and joined at the top to hold hoisting tackle: also shearlegs (sirlegz)


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