1.   A shrill whistle could be discerned, audible above the scrape and screech of the music.

2.   A shrill whistle is blown angrily by a shivering soldier, a sentry at the tomb.

3.   Call a series of fluty piping notes, also a shrill whistle.

4.   Flora gave a shrill whistle and started trotting down the cliff.

5.   The kettle emitted a shrill whistle.

6.   Then he put his fingers in his mouth and let out a shrill whistle.

7.   The policeman was blowing a shrill whistle.

8.   And instead of scolding raucous students with a shrill whistle, Hamilton uses carefully chosen language to make students reflect on what is now known as inappropriate behavior.