Webster's English Dictionary

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sap

Cross references:
  1. weaken                
 
1. sap \'sap\ n [ME, fr. OE sp; akin to OHG saf sap] 1a: the fluid 
   part of a plant; specif : a watery solution that circ ulates through a 
   plant's vascular system 1b1: a body fluid (as blood) essential to life, 
   health, or vigor  1b2: bodily health and vigor : VITALITY  2: a foolish 
   gullible person  3: BLACKJACK, BLUDGEON 
2. sap vt or sapped;  or sap.ping 1: to drain or deprive of sap  2: to 
   knock out with a sap 
3. sap n [MF & OIt; MF sappe hoe, fr. OIt Zappa] : the extension of a 
   trench from within the trench itself to a point benea th an enemy's 
   fortifications
4. sap vb or sapped;  or sap.ping : to proceed by or execute a sap  1: to 
   subvert by digging or eroding the substratum or foundation : UN DERMINE 2: 
   to weaken or exhaust the energy or vitality of  3: to operate against or 
   pierce by a sap