hollo hollo /ˈhɑːˌloʊ/

noun

1. [Non-standard] A very loud utterance (like the sound of an animal)  ( bellowing , holla [Archaic] , hollo [Non-standard] , bellow , holler [Informal] , holloa , roar , roaring , yowl , hollering [Informal] )
   a very loud utterance (like the sound of an animal)
    His bellow filled the hallway
   his bellow filled the hallway
   

verb

1. [Non-standard] Utter a sudden loud cry  ( hollo [Non-standard] , shout out , squall , call , cry , holler [Informal] , scream , shout , yell )
   utter a sudden loud cry
    She cried with pain when the doctor inserted the needle
   she cried with pain when the doctor inserted the needle
    I yelled to her from the window but she couldn't hear me
   I yelled to her from the window but she couldn't hear me
   
   
2. [Non-standard] Cry hollo  ( hollo [Non-standard] )
   cry hollo
   
3. [Non-standard] Encourage somebody by crying hollo  ( hollo [Non-standard] )
   encourage somebody by crying hollo