What is the meaning of sap?

noun

• A watery solution of sugars, salts, and minerals that circulates through the vascular system of a plant.
• A person who lacks good judgment.
  • synonyms: fool, saphead, muggins, tomfool
• A piece of metal covered by leather with a flexible handle; used for hitting people.
  • synonyms: blackjack, cosh

verb

• Deplete.
  • usage: "exhaust one's savings"; "We quickly played out our strength"
  • synonyms: run down, exhaust, play out, tire
• Excavate the earth beneath. .