Used attributively to modify another noun, e.g. “brace position”; functions as adjective.
Passengers adopted the brace position during the emergency landing.
Пассажиры приняли защитную позу во время аварийной посадки.
Used as an urgent command telling people to prepare for impact or a difficult event.
Синонимы
Brace yourself!
Prepare yourselves!
Get ready!
Hold on!
Hold tight!
Heads up!
Watch out!
Hold fast!