receding

vetäytyminen

hälveneminen

vetäytyvä (present participle of)
The action of something that recedes; a recessed part.
1820, John Gibson Lockhart, Peters Letters to His Kinsfolk'' (page 20)

The sombre shadows, cast by those huge houses of which it is composed, and the streams of faint light cutting the darkness here and there, where the entrance to some fantastic alley pierces the sable mass of building—the strange projectings, recedings, and windings (..)

the great overflowings and recedings of the waters