noun

• (uncountable) The juice of plants of any kind, especially the ascending and descending juices or circulating fluid essential to nutrition.
• (uncountable) The sapwood, or alburnum, of a tree.
• (figurative) Vitality.
• (slang, countable) A naive person; a simpleton.
  "Look at the sap mowing our lawn while we pretend our own lawnmower is broken."

verb

• (transitive) To drain, suck or absorb from (a tree, etc.).
• (transitive, figurative) To exhaust the vitality of.
  "Somewhat he knoweth of art magical, yet useth not that art; for it sappeth the life and strength, nor is it held worthy that a Demon should put trust in that art, but rather in his own might and main."

noun

• (countable, US, slang) A short wooden club; a leather-covered hand weapon; a blackjack.
  "I risk my whole future, the hatred of the cops and Eddie Mars' gang. I dodge bullets and eat saps."

verb

• (transitive, slang) To strike with a sap (with a blackjack).
  "[A]s he passes the mouth of a narrow alley two men step out quickly. One of them saps Marlowe expertly — they drag him out of sight."