adjective
Definition: Having a very high and sharp sound that can be unpleasant to hear.
Example: The shrill whistle of the train could be heard from miles away.
intransitive verb
Definition: To make a high-pitched and piercing sound.
Example: The bird began to shrill loudly at dawn.
noun
Definition: A high-pitched and piercing sound that is often unpleasant to hear.
Example: The shrill of the alarm clock woke me up suddenly.
transitive verb
Definition: To make a high-pitched and piercing sound, often in a loud or unpleasant way.
Example: The child shrilled with excitement when she saw the puppy.