This is Becoming a Habit

Hey, you want to render a bomb harmless?  You want to DEFUSE it.  DE-, remove, render ineffective; FUSE, the trigger mechanism.  D E F U S E.

To DIFFUSE something, on the other hand, is to cause it to become scattered, less dense, widely separated, even to the exent of disappearing into its surrounding medium; as for example, ink diffusing into water, or morning fog diffused in a breeze.

The easiest way to diffuse a bomb would be not to bother defusing it.