1) Pitfall 
• (n.) A quicksand.
Syr'tis noun ; plural Syrtes . [ See Syrt .] A quicksand. « Quenched in a boggy syrtis , neither sea Nor good dry land.» Milton. 
HMS Syrtis was a British Sealion Class submarine of 715 tons displacement launched during the early 1940's and sunk during the Second World War. HMS Syrtis was armed with one 3-inch gun; one 20 mm anti-aircraft gun; three machine-guns; six 21-inch torpedo tubes in the bow and one external 21 inch torpedo tube. She had a top speed of 14.5 knots surf...