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plural lakebeds
The bottom of a lake, especially after the lake has gone dry. quotations examples
Where the viaduct crosses the lake, the piles will be bored directly into the lakebed, using a cofferdam to hold back the water while the pier is built.
2022 January 12, “Network News: First pier cast for HS2's Colne Valley Viaduct”, in RAIL, number 948, page 10