waterstep

plural watersteps

1. A step that goes down to a body of water.

   One had jumped onto a submerged waterstep and was tying up the skiff.

   2018, Pauline Gedge, The Oasis

   2 more examples

   They nodded at each other, he himself still walking past the door without pausing, already past in fact and straddling the waterstep out on to the stern of the ship, the cool off-shore wind in his face, before the slow-remembered image of the clock-face on the bulkhead behind Dutchie fixed itself in his mind.

   1958, Robin Hiscock, The Killer Wind, page 7

   Once, they'd opened onto a waterstep above one of the nameless little canals that cut through the Flats; now the canal came right into the room.

   2011, Felix R. Savage, Mercy