The word fuse has several related meanings:

1. To join or blend things together, especially by melting or heating. When a metalworker fuses two pieces of metal, they heat them until they melt together into one solid piece. Scientists can fuse atoms together in nuclear fusion, the same process that powers the sun. In cooking, flavors might fuse together as ingredients cook, creating something new and delicious.
2. A safety device that protects electrical circuits from too much current. A fuse is a small component with a thin wire inside that melts and breaks the circuit if too much electricity flows through it, preventing fires or damage. When too many appliances run at once, a fuse might “blow,” cutting off power until someone replaces it. Modern homes often use circuit breakers instead of fuses, but the principle remains the same.
3. A cord or device that ignites an explosion. In old cartoons, you might see someone light a fuse on a stick of dynamite, and the flame travels along the cord until it reaches the explosive. Fireworks use fuses to control when they explode. The phrase “short fuse” comes from this meaning: someone with a short fuse gets angry quickly, like an explosive that detonates almost immediately after being lit.