Webster's English Dictionary

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nag

1. nag \'nag\ n [ME nagge; akin to D negge small horse] : HORSE; esp : one 
   that is old or in poor condition 
2. nag \-in-le-\ vb or nagged;  or nag.ging [prob. of Scand origin; akin to 
   ON gnaga to gnaw; akin to OE gnagan] to gnaw 1: to find fault incessantly : 
   COMPLAIN  2: to be a continuing source of annoyance  1: to irritate by 
   constant scolding or urging  2: BADGER, WORRY  - nag.ger n