Sap is sugary water that is found in the vascular system of some plants or a gullible person who can easily be tricked.(noun)
To sap is to weaken someone or to destroy their spirit, energy or power, especially when done slowly over time.(verb)
An example of sap is a teen who is rebellious and continually drains the energy of her parents.
See sap in Webster's New World College Dictionary
Origin: < sapheadSlang a stupid person; fool
Origin: ME < OE sæp, akin to Ger saft < IE base *sab-, var. of *sap-, to taste, perceive > L sapere, to taste, know
Origin: MFr sappe < the v.
Origin: MFr sapper < sappe, a hoe < VL sappa, orig. he-goat, prob. < Illyrian *zapp-
See sap in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English sǽp.
Origin: Obsolete French sappe
Origin: or Italian zappa, hoe
Origin: , from Old French
Origin: and Old Italian
Origin: , both from Late Latin sappa.
Learn more about sap