Webster's English Dictionary

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groan

groan \'gro-n\ vb [ME gronen, fr. OE gra-nian; akin to OHG gri-nan to 
   gro]wl 1: to utter a deep moan indicative of pain, grief, or annoyance  2: 
   to make a harsh sound under sudden or prolonged strain  : to utter or 
   express with groaning  - groan n