Sap [Noun]
the fluid, chiefly water with dissolved sugars and mineral salts, that circulates in the vascular system of a plant; vigor or energy; {historical} a tunnel or trench to conceal an assailant's approach to a fortified place; {informal} {north america} a foolish and gullible person; a bludgeon or club
"juice or fluid which circulates in plants, the blood of plant life," Middle English sap, from Old English sæp, from Proto-Germanic *sapam (source also of Middle Low German, Middle Dutch, Dutch sap, Old High German saf, and, with unetymological -t, German Saft "juice"). This is reconstructed to be from PIE root *sab- "juice, fluid" (source also of Sanskrit sabar- "sap, milk, nectar," Irish sug, Russian soku "sap," Lithuanian sakas "tree-gum"). As a verb meaning "to drain the sap from," by 1725.
[ sap ]