[W/K] :: To act on

  Act \Act\, v. i.
     1. To exert power; to produce an effect; as, the stomach acts
        upon food.
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     2. To perform actions; to fulfill functions; to put forth
        energy; to move, as opposed to remaining at rest; to carry
        into effect a determination of the will.
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              He hangs between, in doubt to act or rest. --Pope.
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     3. To behave or conduct, as in morals, private duties, or
        public offices; to bear or deport one's self; as, we know
        not why he has acted so.
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     4. To perform on the stage; to represent a character.
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              To show the world how Garrick did not act. --Cowper.
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     To act as or To act for, to do the work of; to serve as.
        
  
     To act on, to regulate one's conduct according to.
  
     To act up to, to equal in action; to fulfill in practice;
        as, he has acted up to his engagement or his advantages.
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