plowhorse
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plug — I (New American Roget s College Thesaurus) n. stopper, cork, dowel, plunger, tampon; quid, wad; wadding, padding, stopple, spigot. See closure. II (Roget s IV) n. 1. [An implement to stop an opening] Syn. cork, stopper, stopple, filling, stoppage … English dictionary for students