fuse1
  
  v.
    - join, blend, or coalesce to form a single entity.
 - melt (a material or object) with intense heat, so as to join it with something else.
 - Brit. (with reference to an electrical appliance) stop or cause to stop working when a fuse melts.
 - provide (a circuit or electrical appliance) with a fuse.
 
n.
 a safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level.
 
  Etymology
  C16: from L. fus-, fundere ‘pour, melt’.
 
  
    
fuse2
  
  n.
 a length of material along which a small flame moves to explode a bomb or firework. 
▸a device in a bomb that controls the timing of the explosion.
v.
 fit a fuse to (a bomb).
 
  Derivative
  
  Etymology
  C17: from Ital. fuso, from L. fusus ‘spindle’.