Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. To finish by subjecting to a hammering process in a beetle
      or beetling machine; as, to beetle cotton goods.

Source : WordNet®

beetling
     adj : jutting or overhanging; "beetle brows" [syn: {beetle}]