training wall

noun

noun

A wall, bank or jetty built to confine and direct the flow of a river, watercourse or tide.

A training wall of steel-sheet piling driven down 25 ft. now forms the other side of the mill lade.1950 January, “Re-Opening of the Eyemouth Branch”, in Railway Magazine, page 11:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.