I. ˈau̇ch noun
Etymology: Middle English, alteration (from misdivision of a nouche ) of nouche, from Anglo-French nusche, nouche, of Germanic origin; akin to Old High German nusca clasp
Date: 14th century
1. obsolete : clasp , brooch
2.
a. : a setting for a precious stone
b. : jewel , ornament ; especially : a buckle or brooch set with precious stones
II. interjection
Etymology: origin unknown
Date: 1838
— used especially to express sudden pain