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shea
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shear pin
shear pin (plural shear pins)


noun 
Definition:
 
breakable pin for stopping machine: a pin inserted in a machine as a safety device. If safe loads are exceeded, the pin breaks and the machine shuts down.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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