noun
rogue wave; freak wave
A single, unexpectedly large ocean wave that can be dangerous to ships. Often used in maritime and surfing contexts. The term フリーク波 is a synonym.
See also: フリーク波
一発大波は突然現れ、船を襲うことがある。
Rogue waves can appear suddenly and strike ships.
サーファーは一発大波を求めて沖へ出た。
The surfer went offshore in search of a freak wave.