What does fuse mean?
Fuse is a word with two very different lives. As a noun, it names a small but critical piece of engineering: a strip of wire inside an electrical device designed to melt and break the circuit if too much current flows, sacrificing itself so that appliances and homes are not destroyed by overload. It can also refer to the length of cord historically used to carry a flame to an explosive charge. As a verb, fuse describes melting or merging — soldering metal parts together, or more abstractly, blending ideas, styles, or musical traditions into something unified and seamless. The word carries connotations of both protection and danger: a blown fuse halts disaster, while a lit fuse counts down toward an explosion, which is why 'short fuse' works as a vivid metaphor for a quick temper. From household wiring to culinary and artistic fusion, the word captures the moment where separate things become one — or are safely kept apart.
A safety device consisting of a thin wire or strip that melts when excess current passes through it, thereby breaking an electrical circuit.
"Always unplug the appliance before checking whether the fuse has blown."
Also used for the cord or tube that conveys fire to an explosive charge.
To melt together, especially metals, or to blend separate elements into a unified whole.
"Heat the glass until the two pieces fuse completely."
Standard plural for the physical devices; the verb form does not take a plural.
"We keep a drawer full of spare fuses in the garage."
The same Latin root that gave us 'fuse' also gave us 'infuse', 'diffuse', and 'transfuse' — one little verb of pouring, powering everything from tea to electronics.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fuse
Fuse traces back to the Latin verb fundere, meaning to pour or melt, through its past-participial stem fus-. The electrical device sense arose in the late nineteenth century as electric circuits were first safeguarded with meltable wires, while the igniting-cord sense developed earlier alongside firearms and explosives. The same Latin stem produced a rich family of related words, including infuse, diffuse, transfuse, and effusive, all sharing the idea of pouring or spreading something. The noun 'fusion', for blending or melting together, comes from the same ultimate root.
Related word forms
How fuse is actually used
In British English, 'fuse' also informally refers to a domestic electrical circuit protected by its own fuse in the consumer unit; blowing a fuse is common shorthand for a sudden loss of power. The phrase 'short fuse' extends the literal meaning metaphorically to describe someone who loses their temper quickly, giving the word a mild emotional connotation beyond its technical senses.
Easily confused with fuse
Fuze is a less common variant spelling used specifically for detonating devices in munitions, whereas fuse covers both the electrical safety device and general blending sense.