fuse [fyooz] noun, verb, FUSED, fus‧ing.

1. (noun)
   Electricity. a protective device, used in an electric circuit, containing a conductor that melts under heat produced by an excess current, thereby opening the circuit.
2. verb (used with object)
   to combine or blend by melting together; melt.
3. to unite or blend into a whole, as if by melting together
4. verb (used without object)
   to become liquid under the action of heat; melt
5. to become united or blended
6. Chiefly British. to overload an electric circuit so as to burn out a fuse.
7. (idiom)
   blow a fuse, Informal. to lose one’s temper; become enraged.

[Origin: 1675–85; < L fūsus melted, poured, cast, ptp. of fundere]