fuse

FUSE noun

[ C ] uk/fjuːz/ us fuse noun [C]
(BOMB)

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

запал, взрыватель
Light the fuse , and then stand back.
fuse verb [ I,T ] uk/fjuːz/ us fuse verb [I, T]
(JOIN)

to join or become combined

соединять(ся)
The bones of the skull are not properly fuse d at birth.