Liddell–Scott–Jones: κολόκῡμα

κολόκῡμα,ατος,τό,

A. large heavy wavebefore it breaks,swellthat is the forerunner of a storm: metaph., of the swelling threats of Cleon, Ar. Eq. 692 (expld. asκόλον κῦμα, Sch.ad loc.;τυφλὸν κῦμα, Hsch. ;κωφὸν κῦμα, Suid. ).