Fuse1  —v. (-sing) 1 melt with intense heat. 2 blend into one whole by melting. 3 provide (an electric circuit) with a fuse. 4 a (of an appliance) fail owing to the melting of a fuse. B cause to do this. —n. Device with a strip or wire of easily melted metal placed in an electric circuit so as to interrupt an excessive current by melting. [latin fundo fus- melt]