Source : Webster's Revised Unabridged Dictionary (1913)

Assuage \As*suage"\, v. t. [imp. & p. p. {Assuaged}; p. pr. &
   vb. n. {Assuaging}.] [OE. asuagen, aswagen, OF. asoagier,
   asuagier, fr. assouagier, fr. L. ad + suavis sweet. See
   {Sweet}.]
   To soften, in a figurative sense; to allay, mitigate, ease,
   or lessen, as heat, pain, or grief; to appease or pacify, as
   passion or tumult; to satisfy, as appetite or desire.

         Refreshing winds the summer's heat assuage. --Addison.

         To assuage the sorrows of a desolate old man --Burke.

         The fount at which the panting mind assuages Her thirst
         of knowledge.                            --Byron.

   Syn: To alleviate; mitigate; appease; soothe; calm;
        tranquilize; relieve. See {Alleviate}.

Assuage \As*suage"\, v. i.
   To abate or subside. [Archaic] ``The waters assuaged.''
   --Gen. vii. 1.

         The plague being come to a crisis, its fury began to
         assuage.                                 --De Foe.

Source : WordNet®

assuage
     v 1: cause to be more favorably inclined; gain the good will of;
          "She managed to mollify the angry customer" [syn: {pacify},
           {lenify}, {conciliate}, {appease}, {mollify}, {placate},
           {gentle}, {gruntle}]
     2: satisfy (thirst); "The cold water quenched his thirst" [syn:
         {quench}, {slake}, {allay}]
     3: provide physical relief, as from pain; "This pill will
        relieve your headaches" [syn: {relieve}, {alleviate}, {palliate}]