fuse

A fuse is a length of cord that will burn and is used to set off explosives.

Example: After lighting the fuse, the miners moved away to a safe area.

A fuse is a switch used to set off an explosive.

Example: The soldier carefully set the fuse on the bomb.

A fuse is a thin piece of wire that will melt if it gets too hot.

Example: We lost power after after the faulty toaster made the fuse melt.

To fuse is to melt with heat.

Fuse is to mix or join two or more things together.