pounce1
  
  v.
  - spring or swoop suddenly to catch or as if to catch prey.
 - notice and take swift advantage of a mistake or sign of weakness.
 
n.
 an act of pouncing.
 
  Derivative
  
  Etymology
  ME (denoting a tool for punching, later ‘claw, talon’): origin obscure, perh. from puncheon1.
 
  
    
pounce2
  
  n.
  - a fine resinous powder formerly used to prevent ink from spreading on unglazed paper or to prepare parchment to receive writing.
 - powdered charcoal or other fine powder dusted over a perforated pattern to transfer the design to the surface beneath.
 
v.
  - smooth down by rubbing with pounce or pumice.
 - transfer (a design) by the use of pounce.
 
 
  Derivative
  
  Etymology
  C16: from Fr. poncer, based on L. pumex ‘pumice’.