The fluid, chiefly water with dissolved sugars and mineral salts, that circulates in the vascular system of a plant. The maple tree was tapped to collect its sap for syrup production.
A foolish or gullible person. He felt like a sap for believing the scammer's story.
A deep, narrow trench constructed to approach or undermine an enemy's fortifications. The soldiers dug a sap to get closer to the enemy's stronghold.
Vitality, energy, or vigor, especially characteristic of youth. Even in his seventies, he still had the sap of a much younger man.
A short, flexible club used as a weapon; a blackjack. The detective carried a sap in his coat pocket.