sap

/sæp/

verb

I need to sap the energy from my opponents.

意味（1）

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

Nor safe their dwellings were, for sapped by floods, / Their houses fell upon their household gods.

意味（2）

(transitive, military) To pierce with saps.

意味（3）

(transitive) To make unstable or infirm; to unsettle; to weaken.

Ring out the grief that saps the mind […]

意味（4）

(transitive) To gradually weaken.

to sap one’s conscience

意味（5）

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