Definition of "peening" []

• The hardening of a metal surface by hammering, or by blasting with shot (noun)

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• "Hot-rodders of 40 years ago would toughen their crankshafts and connecting rods by shot-peening them after the machining process."
• "The fact that it lost that high pitched clank is probably due to the fact that the recoil lugs are now mostly seated due to work-lapping and peening."
• "Explain and demonstrate the upsetting of the work-piece and peening of the axe head."