Webster's English Dictionary

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ouch

1. ouch \'au.ch\ n [ME, alter. (resulting fr. incorrect division of a 
   nouche) of noucheX, fr. MF, of Gmc origin; akin to OHG nusca clasp; akin to 
   OE net obs  1: CLASP, BROOCH  2a: a setting for a precious stone  2b: 
   JEWEL, ORNAMENT; esp : a buckle or brooch set with  precious stones
2. ouch ij [origin unknown] : - used to express sudden pain or displeasure