The Collaborative International Dictionary of English v.0.48:

Allay \Al*lay"\, v. t.
   To diminish in strength; to abate; to subside. "When the rage
   allays." --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Allay \Al*lay"\, n.
   Alleviation; abatement; check. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Allay \Al*lay"\, n.
   Alloy. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Allay \Al*lay"\, v. t.
   To mix (metals); to mix with a baser metal; to alloy; to
   deteriorate. [Archaic] --Fuller.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Allay \Al*lay"\, v. t. [imp. & p. p. Allayed; p. pr. & vb. n.
   Allaying.] [OE. alaien, aleggen, to lay down, put down,
   humble, put an end to, AS. [=a]lecgan; [=a]- (cf. Goth. us-,
   G. er-, orig. meaning out) + lecgan to lay; but confused with
   old forms of allege, alloy, alegge. See Lay.]
   1. To make quiet or put at rest; to pacify or appease; to
      quell; to calm; as, to allay popular excitement; to allay
      the tumult of the passions.
      [1913 Webster]

   2. To alleviate; to abate; to mitigate; as, to allay the
      severity of affliction or the bitterness of adversity.
      [1913 Webster]

            It would allay the burning quality of that fell
            poison.                               --Shak.
      [1913 Webster]

   Syn: To alleviate; check; repress; assuage; appease; abate;
        subdue; destroy; compose; soothe; calm; quiet. See
        Alleviate.
        [1913 Webster]

WordNet (r) 3.0 (2006):

allay
    v 1: lessen the intensity of or calm; "The news eased my
         conscience"; "still the fears" [syn: still, allay,
         relieve, ease]
    2: satisfy (thirst); "The cold water quenched his thirst" [syn:
       quench, slake, allay, assuage]