What is "crescendoing"

Usage examples of "crescendoing".

But the guidance came not from Nicolson but in the shape of a crescendoing roar of an aircraft engine, the triphammer thudding of aircraft cannon and a shell that screamed through the smashed window above their heads and blasted the top of the chartroom door off its hinges.

And then he had rolled and twisted his way into shelter and safety, there was a brief, crescendoing thunder of, sound and the planes had swept by only feet above the wheel-house.

Dead on time, just seconds after the third rocket had been fired to curve upwards and explode into incandescent light in the star-dusted darkness above, we heard the high-pitched whine approaching out of the south-west, and in an incredibly short space of time a vague dark blur, carrying no navigation lights, screamed by five hundred feet overhead, banked in the distance, came at us again at much reduced speed, banked a second time and then, with a crescendoing banshee shriek of the jet engine, had vanished again into the vaguely lightening darkness to the south-east before we had realised that the pilot had made his drop.