When you consider that it’s a process involving the ignition of large quantities of fuel and resulting in a 1000 mph efflux with purple/orange flames, shock diamonds and deafening roaring, crackling noises - ‘reheat’ is really just another example of charming British understatement, isn’t it?
Whereas ‘afterburner’ is somewhat more picturesque and descriptive, and also just fine as far as I’m concerned.