The Collaborative International Dictionary of English v.0.48:

Pay \Pay\ (p[=a]), v. i.
   To give a recompense; to make payment, requital, or
   satisfaction; to discharge a debt.
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         The wicked borroweth, and payeth not again. --Ps.
                                                  xxxvii. 21.
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   2. Hence, to make or secure suitable return for expense or
      trouble; to be remunerative or profitable; to be worth the
      effort or pains required; as, it will pay to ride; it will
      pay to wait; politeness always pays.
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   To pay for.
      (a) To make amends for; to atone for; as, men often pay
          for their mistakes with loss of property or
          reputation, sometimes with life.
      (b) To give an equivalent for; to bear the expense of; to
          be mulcted on account of.
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                'T was I paid for your sleeps; I watched your
                wakings.                          --Beau. & Fl.
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   To pay off. [Etymol. uncertain.]
      (a) (Naut.) To fall to leeward, as the head of a vessel
          under sail.
      (b) to repay (a debt).

   To pay on. [Etymol. uncertain.] To beat with vigor; to
      redouble blows. [Colloq.]

   To pay round [Etymol. uncertain.] (Naut.) To turn the
      ship's head.
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