a specialist regiment of the British army that is trained in commando techniques of warfare and used in clandestine operations (especially against terrorist groups)
"The SAS was deployed on a covert mission to dismantle the terrorist network without alerting their handlers."
Initialism of stability augmentation system.
"The pilot adjusted the SAS controls to help stabilize the aircraft during turbulent weather."
"The loud noise from the front door made everyone jump in their seats."
Initialism of Special Air Service; an elite unit of the British army. Similar units operate in the Australian and New Zealand armies.
"The family proudly displayed their ancestral sas, an intricate Eastern European coat of arms featuring a golden eagle on red velvet."
An Eastern European coat of arms.