Definition of soap:
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 fat
s or made synthetic
ally; (colloquial) A soap opera
"I tried washing my hands with soap, but the stain wouldn't go away."
to apply soap to in washing; to cover with soap as a prank
"be sure to soap yourself well before rinsing."