Genioglossus Advancement (GA), is a surgical procedure where the base of the tongue is pulled forward, usually to increase airway size due to deformity or a sleep breathing disorder - See Sleep Apnea

Sleep apnea

Sleep apnea is a sleep disorder characterized by abnormal pauses in breathing or instances of abnormally low breathing, during sleep. Each pause in breathing, called an apnea, can last from a few seconds to minutes, and may occur 5 to 30 times or more an hour. Similarly, each abnormally low...

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Tongue muscles are attached to the lower jaw below the teeth.
In this procedure, a small window or slice is made in the lower jaw.
The piece of bone along with the attachment for the tongue is pulled forward and down, then
fastened to the outside of the lower jaw.
A small screw or a plate is used to affix the bone.

Currently this procedure is very effective at treating OSA (Obstructive Sleep Apnea) with a success rate between 50-75%.