The definition of a cushion is something padded that adds comfort, support or lessens impact.(noun)
Cushion is defined as to add padding or protect from impact.(verb)
An example of cushion is wearing knee pads while gardening.
See cushion in Webster's New World College Dictionary
Origin: ME cuisshin < OFr coissin < ML coxinum, altered (after L coxa, hip) < Gallo-Roman *culcinum, for L culcita, cushion, quilt
See cushion in American Heritage Dictionary 4
Origin: Middle English cushin, from Old French coussin, from Vulgar Latin *coxīnum, from Latin coxa, hip.
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