Meaning of “fuse” - Learner’s Dictionary

fuse

noun [ C ] uk us /fjuːz/
ELECTRICAL EQUIPMENT

a small object that stops electrical equipment working if there is too much electricity going through it:

The fuse has blown. You'll have to change it.
a fuse box
BOMB

the part of a bomb or other explosive object that starts the explosion:

Light the fuse, and then stand back.

(Definition of “fuse noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)