[W/K] :: trigger

  Trigger \Trig"ger\, n. [For older tricker, from D. trekker, fr.
     trekken to draw, pull. See Trick, n.]
     1. A catch to hold the wheel of a carriage on a declivity.
        [1913 Webster]
  
     2. (Mech.) A piece, as a lever, which is connected with a
        catch or detent as a means of releasing it; especially
        (Firearms), the part of a lock which is moved by the
        finger to release the cock and discharge the piece.
        [1913 Webster]
  
     Trigger fish (Zool.), a large plectognath fish ({Balistes
        Carolinensis or Balistes capriscus) common on the
        southern coast of the United States, and valued as a food
        fish in some localities. Its rough skin is used for
        scouring and polishing in the place of sandpaper. Called
        also leather jacket, and turbot.
        [1913 Webster]

  trigger
       n 1: lever that activates the firing mechanism of a gun [syn: gun
            trigger]
       2: a device that activates or releases or causes something to
          happen
       3: an act that sets in motion some course of events [syn: induction,
           initiation]
       v 1: put in motion or move to act; "trigger a reaction"; "actuate
            the circuits" [syn: trip, actuate, activate, set
            off, spark off, spark, trigger off, touch off]
       2: release or pull the trigger on; "Trigger a gun"

  trigger
       
           An action causing the automatic invocation of a
          procedure, for instance to preserve referential integrity.
          A triggers goes into effect when a user attempts to modify
          data with an insert, delete, or update command.  A trigger can
          instruct the system to take any number of actions when a
          specified change is attempted.  By preventing incorrect,
          unauthorized, or inconsistent changes to data, triggers help
          maintain the integrity of the database.
       
          [Sybase SQL Server Release 10.0 Transact-SQL User's Guide].
       
          (1995-02-22)