sneaker wave

Noun

A disproportionately large coastal wave that can sometimes appear in a wave train without warning.

Japanese Meaning

予告なしに突然押し寄せる、非常に大きな海岸沿いの波

The photographer was knocked off his feet by a sneaker wave that rolled up the beach without warning.

写真家は、不意に浜辺に押し寄せた非常に大きな沿岸の波に足を取られた。

Sense（1）

A disproportionately large coastal wave that can sometimes appear in a wave train without warning.

sneaker waves

（ plural ）