To perform a glissade.
A fencing move that may disarm the opponent (Wikipedia).
A gliding step beginning and ending in a demi-plié in second position (Wikipedia).
A sliding, as down a snow slope in the Alps (Wikipedia).
A move in some dances such as the galop (Wikipedia).
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.