1559, from hide (n.1) + past tense of bind. Original ref. is to emaciated cattle with skin sticking closely to backbones and ribs; metaphoric sense of "restricted by narrow attitudes" is first recorded 1603.
Main Entry: hide·bound Pronunciation: 'hId-"baund Function: adjective 1: having a dry skin lacking in pliancy and adhering closely to theunderlying flesh —used of domestic animals 2: having scleroderma —used of human beings