pat2
  
  adj.
 simple and somewhat glib or unconvincing:
 a pat answer.
adv.
 conveniently or opportunely.
 
  Phrase
  
    - have something off 
(or down)
 pat
 have something memorized perfectly.  - stand pat
 chiefly N. Amer.  - stick stubbornly to one's opinion or decision.
 - (in poker and blackjack) retain one's hand as dealt.
 
 
   
  Derivative
  
  Etymology
  C16: rel. to pat1; appar. orig. ‘as if with a pat’.