The Collaborative International Dictionary
plonge
Plong'ee \Plon`g['e]e"\, n. [F. See Plunge.] (Mil.) A slope or sloping toward the front; as, the plong['e]e of a parapet; the plong['e]e of a shell in its course. [Sometimes written plonge.]
Wiktionary
plonge
vb. (context transitive English) To cleanse, as open drains which are entered by the tide, by stirring up the sediment when the tide ebbs.
Usage examples of "plonge".
For he that from any effect hee seeth come to passe, should reason to the next and immediate cause thereof, and from thence to the cause of that cause, and plonge himselfe profoundly in the pursuit of causes.