Definition of "impingement" [im•pinge•ment]

• The act of impinging. (noun)

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• "Sometimes, a narrow space for passage of tendon underneath the shoulder blade can result in direct mechanical abrasion of the tendon, and has been commonly called impingement syndrome."
• "Might the bumps or irregular shapes they call impingement be just normal variations?"
• "However, another popular design is the top-down (aka impingement or C-type) style."