The definition of a shower is a person who displays or exhibits, or is a brief fall of rain or snow, or is bathing by standing under flowing water, or a party to celebrate a future event.(noun)
Shower is defined as to make wet or to bathe, or for something to fall on someone as if from bathing.(verb)
See shower in Webster's New World College Dictionary
Origin: ME schoure < OE scur, akin to Ger schauer, shower, squall < IE base *(s)keu-, to cover > shoe, hide
See shower in American Heritage Dictionary 4
Origin: Middle English shour
Origin: , from Old English scūr.
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