v. t. [ See Plunge. ] To cleanse, as open drains which are entered by the tide, by stirring up the sediment when the tide ebbs. [ 1913 Webster ]
‖n. [ F. See Plunge. ] (Mil.) A slope or sloping toward the front; as, the plongée of a parapet; the plongée of a shell in its course. [ Sometimes written plonge. ] [ 1913 Webster ]