To make a shrill noise.
A shrill sound.
Sharp or keen to the senses.
Having a shrill voice.
Fierce, loud, strident.
High-pitched and piercing.
To use a snorkel.
A snorkel parka.
A retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth.
A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater.