noun.the fluid part of a plant; specifically: a watery solution that circulates through a plant's vascular system

noun.a body fluid (such as blood) essential to life, health, or vigor

noun.bodily health and vigor

verb.to drain or deprive of sap

verb.to knock out with a sap

verb.to proceed by digging a sap

• sapped her patience
• the illness sapped him of his stamina

verb.to subvert by digging or eroding the substratum or foundation: undermine

verb.to gradually diminish the supply or intensity of

noun.the extension of a trench to a point beneath an enemy's fortifications