LSJ
Pass., boil with conflicting waves, dash hither and thither, Plu. 2.897c; of wind in a cul-de-sac, surge back, Orib. 9.20.3.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
[ῡ], voneinander widerstrebenden Wogen bewegt werden, Plut. plac.phil. 3.17.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)