—n. 1. Elect.a protective device, used in an electric circuit, containing a conductor that melts under heat produced by an excess current, thereby opening the circuit. Cf. circuit breaker. 2. blow a fuse,Informal.to lose one's temper; become enraged: If I'm late again, they'll blow a fuse.
—v.t. 1. to combine or blend by melting together; melt.
2. to unite or blend into a whole, as if by melting together: The author skillfully fuses these fragments into a cohesive whole.
—v.i. 1. to become liquid under the action of heat; melt: At a relatively low temperature the metal will fuse. 2. to become united or blended: The two groups fused to create one strong union. 3. Chiefly Brit.to overload an electric circuit so as to burn out a fuse.