NAG

Source: 566, 567

nag. Nag, n. a faddle-horse, a little or young horse

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Nag (năg), n. [[OE. nagge, D. negge; akin to E. neigh.]] 1. 1. A small horse; a pony; hence, any horse.
2. 2. A paramour; — in contempt. Shak.