The Collaborative International Dictionary of English v.0.48:

Deluge \Del"uge\ (d[e^]l"[-u]j), n. [F. d['e]luge, L. diluvium,
   fr. diluere wash away; di- = dis- + luere, equiv. to lavare
   to wash. See Lave, and cf. Diluvium.]
   1. A washing away; an overflowing of the land by water; an
      inundation; a flood; specifically, The Deluge, the great
      flood in the days of Noah (--Gen. vii.).
      [1913 Webster]

   2. Fig.: Anything which overwhelms, or causes great
      destruction. "The deluge of summer." --Lowell.
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            A fiery deluge fed
            With ever-burning sulphur unconsumed. --Milton.
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            As I grub up some quaint old fragment of a [London]
            street, or a house, or a shop, or tomb or burial
            ground, which has still survived in the deluge. --F.
                                                  Harrison.
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            After me the deluge.
            (Apr['e]s moi le d['e]luge.)          --Madame de
                                                  Pompadour.
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The Collaborative International Dictionary of English v.0.48:

Deluge \Del"uge\, v. t. [imp. & p. p. Deluged; p. pr. & vb. n.
   Deluging.]
   1. To overflow with water; to inundate; to overwhelm.
      [1913 Webster]

            The deluged earth would useless grow. --Blackmore.
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   2. To overwhelm, as with a deluge; to cover; to overspread;
      to overpower; to submerge; to destroy; as, the northern
      nations deluged the Roman empire with their armies; the
      land is deluged with woe.
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            At length corruption, like a general flood . . .
            Shall deluge all.                     --Pope.
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WordNet (r) 3.0 (2006):

deluge
    n 1: an overwhelming number or amount; "a flood of requests"; "a
         torrent of abuse" [syn: flood, inundation, deluge,
         torrent]
    2: a heavy rain [syn: downpour, cloudburst, deluge,
       waterspout, torrent, pelter, soaker]
    3: the rising of a body of water and its overflowing onto
       normally dry land; "plains fertilized by annual inundations"
       [syn: flood, inundation, deluge, alluvion]
    v 1: fill quickly beyond capacity; as with a liquid; "the
         basement was inundated after the storm"; "The images
         flooded his mind" [syn: deluge, flood, inundate,
         swamp]
    2: charge someone with too many tasks [syn: overwhelm,
       deluge, flood out]
    3: fill or cover completely, usually with water [syn:
       inundate, deluge, submerge]

The Devil's Dictionary (1881-1906):

DELUGE, n.  A notable first experiment in baptism which washed away
the sins (and sinners) of the world.