1. n. The juice of plants of any kind, especially the ascending and descending juices or circulating fluid essential to nutrition.
2. n. The sapwood, or alburnum, of a tree.
3. n. Any juice.
4. n. (figurative) Vitality.
5. n. (slang) a naive person; a simpleton
6. v. To drain, suck or absorb from (tree, etc.).
7. v. (transitive, figurative) To exhaust the vitality of.
8. n. (US, slang) A short wooden club; a leather-covered hand weapon; a blackjack.
9. v. (transitive, slang) To strike with a sap (with a blackjack).
10. n. (military) A narrow ditch or trench made from the foremost parallel toward the glacis or covert way of a besieged place by digging under cover of gabions, etc.
11. v. To subvert by digging or wearing away; to mine; to undermine; to destroy the foundation of.
12. v. (transitive, military) To pierce with saps.
13. v. To make unstable or infirm; to unsettle; to weaken.
14. v. To gradually weaken.
to sap one’s conscience
15. v. (intransitive) To proceed by mining, or by secretly undermining; to execute saps.
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