n.
      - a cunning or skilful act or scheme intended to deceive or outwit someone. 
▸a mischievous practical joke.
 ▸a skilful act performed for entertainment.
 ▸an illusion:
 a trick of the light.
  ▸
[
as modifier]
 intended to mystify or create an illusion:
 a trick question.
 - a peculiar or characteristic habit or mannerism.
 - (in bridge, whist, etc.) a sequence of cards forming a single round of play.
 - informal a prostitute's client.
 - 
[as modifier]
 N. Amer. liable to fail; defective:
 a trick knee.
 - a sailor's turn at the helm, usually lasting for two or four hours.
 
v.
   - deceive or outwit with cunning or skill. 
▸
(trick someone into/out of)
 deceive someone into doing or parting with.
 - 
(trick someone out/up)
 dress or decorate someone in an elaborate or showy way.
 - Heraldry  sketch (a coat of arms) in outline, with the colours indicated by letters or signs.
 
 
  Phrase
  
    - do the trick
 informal achieve the required result.  - how's tricks?
 informal how are you?  - trick or treat
 a children's custom of calling at houses at Halloween with the threat of pranks if they are not given a small gift.  - tricks of the trade
 special ingenious techniques used in a profession or craft.  - turn a trick
 informal (of a prostitute) have a session with a client. 
   
  Derivative
  
    - tricker n.
  - trickish adj. (dated).
 
   
  Etymology
  ME: from an OFr. dial. var. of triche, from trichier ‘deceive’, of unknown origin.