Hol·lo interj. & n.  Ho there; stop; attend; hence, a loud cry or a call to attract attention; a halloo.
  And every day, for food or play,
  Came to the mariner's hollo.   --Coleridge.
  Hol·lo v. i. [imp. & p. p. Holloed p. pr. & vb. n. Holloing.]  To call out or exclaim; to halloo.
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  hollo
       n : a very loud utterance (like the sound of an animal); "his
           bellow filled the hallway" [syn: bellow, bellowing, holla,
            holler, hollering, holloa, roar, roaring, yowl]
       v 1: encourage somebody by crying hollo
       2: cry hollo
       3: utter a sudden loud cry; "she cried with pain when the
          doctor inserted the needle"; "I yelled to her from the
          window but she couldn't hear me" [syn: shout, shout out,
           cry, call, yell, scream, holler, squall]