sap

The juice of plants of any kind, especially the ascending and descending juices or circulating fluid essential to nutrition.

The sapwood, or alburnum, of a tree.

Any juice.

Vitality.

A naive person; a simpleton

To drain, suck or absorb from (tree, etc.).

To exhaust the vitality of.

A short wooden club; a leather-covered hand weapon; a blackjack.

To strike with a sap (with a blackjack).

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.

To subvert by digging or wearing away; to mine; to undermine; to destroy the foundation of.

To pierce with saps.

To make unstable or infirm; to unsettle; to weaken.

To gradually weaken.

“he saps my energy”

To proceed by mining, or by secretly undermining; to execute saps.