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The Collaborative International Dictionary
get one's Irish up

Irish \I*rish"\, n. sing. & pl.

  1. pl. The natives or inhabitants of Ireland, esp. the Celtic natives or their descendants.

  2. The language of the Irish; also called Irish Gaelic or the Hiberno-Celtic.

  3. An old game resembling backgammon.

    get one's Irish up to become angry.