nag

Nag \Nag\ (n[a^]g), n. [OE. nagge, D. negge; akin to E. neigh.] 1. A small horse; a pony; hence, any horse, especially one that is of inferior breeding or useless. [1913 Webster] 2. A paramour; -- in contempt. [Obs.] --Shak. [1913 Webster]