STRAITEN v. 3 definitions
To make strait; to make narrow; hence, to contract; to confine. Waters, when straitened, as at the falls of bridges, give a roaring noise. Bacon. In narrow circuit, straitened by a foe. Milton.
ASTERN adv.
Behind a ship; in the rear. "A gale of wind right astern." De Foe. "Left this strait astern." Drake. To bake astern, to go stern foremost. -- To be astern of the reckoning, to be behind the position given by the reckoning. -- To drop astern, to fall or be left behind. -- To go astern, to go backward, as from the act…