An Irish person. / A member of the Irish-ethnic Catholic fraternal Ancient Order of Hibernians

(idiomatic) One who persists in an effort in spite of harmful or unpleasant results.

(anatomy) Any of a group of microscopic fibrils through the body of a neuron that extend into the axon and dendrites

To make a close paraphrase of a quotation, using some of its words. / (informal) To modify a quote, adapting it to different circumstances but preserving the intent.