°A substance able to mix with both oil and water, used for cleaning, often in the form of a solid bar or in liquid form, derived from
fats or made
synthetically.
"I tried washing my hands with soap, but the stain wouldn't go away."
°To apply soap to in washing.
"Be sure to soap yourself well before rinsing."
°(colloquial) To cover with soap as a prank.
"Those kids soaped my windows!"