Shrilling means making a very high and loud sound, like a scream or a whistle.
Shrilling can be annoying or scary. It can make people cover their ears.
Examples:
The shrilling sound woke me up.
The shrilling whistle hurt my ears.
Her shrilling scream scared the cat.
The shrilling noise made everyone jump.
The shrilling alarm was so loud it hurt my ears.
The shrilling sound was like a bird singing, but too loud!