The Collaborative International Dictionary of English v.0.48:

Beetle \Bee"tle\, v. i. [See Beetlebrowed.]
   To extend over and beyond the base or support; to overhang;
   to jut.
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         To the dreadful summit of the cliff
         That beetles o'er his base into the sea. --Shak.
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         Each beetling rampart, and each tower sublime.
                                                  --Wordsworth.
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The Collaborative International Dictionary of English v.0.48:

Beetle \Bee"tle\ (b[=e]"t'l), n. [OE. betel, AS. b[imac]tl,
   b?tl, mallet, hammer, fr. be['a]tan to beat. See Beat, v.
   t.]
   1. A heavy mallet, used to drive wedges, beat pavements, etc.
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   2. A machine in which fabrics are subjected to a hammering
      process while passing over rollers, as in cotton mills; --
      called also beetling machine. --Knight.
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The Collaborative International Dictionary of English v.0.48:

Beetle \Bee"tle\ (b[=e]"t'l), v. t. [imp. & p. p. Beetled
   (-t'ld); p. pr. & vb. n. Beetling.]
   1. To beat with a heavy mallet.
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   2. To finish by subjecting to a hammering process in a beetle
      or beetling machine; as, to beetle cotton goods.
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The Collaborative International Dictionary of English v.0.48:

Beetle \Bee"tle\, n. [OE. bityl, bittle, AS. b[imac]tel, fr.
   b[imac]tan to bite. See Bite, v. t.]
   Any insect of the order Coleoptera, having four wings, the
   outer pair being stiff cases for covering the others when
   they are folded up. See Coleoptera.
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   Beetle mite (Zool.), one of many species of mites, of the
      family Oribatid[ae], parasitic on beetles.

   Black beetle, the common large black cockroach (Blatta
      orientalis).
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WordNet (r) 3.0 (2006):

beetle
    adj 1: jutting or overhanging; "beetle brows" [syn: beetle,
           beetling]
    n 1: insect having biting mouthparts and front wings modified to
         form horny covers overlying the membranous rear wings
    2: a tool resembling a hammer but with a large head (usually
       wooden); used to drive wedges or ram down paving stones or
       for crushing or beating or flattening or smoothing [syn:
       mallet, beetle]
    v 1: be suspended over or hang over; "This huge rock beetles
         over the edge of the town" [syn: overhang, beetle]
    2: fly or go in a manner resembling a beetle; "He beetled up the
       staircase"; "They beetled off home"
    3: beat with a beetle