Webster's English Dictionary

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bellow

bel.low \'bel-(.)o-, -*(-w)\ vb [ME belwen, fr. OE bylgian; akin to OE & 
   OHG bellan to roar.]Skt bha-sate he talks 1: to make the loud deep hollow 
   sound characteristic of a bull  2: to shout in a deep voice  : BAWL  - 
   bellow n