押おし波なみ

noun

leading wave; advancing wave

Specifically the initial wave of a tsunami that arrives as a crest before the trough, causing water to rush inland. Often contrasted with 引き波 (the receding wave).

See also: 引き波

• 津つ波なみの押おし波なみで海かい岸がん線せんが一いっ気きに浸しん水すいした。

  The leading wave of the tsunami flooded the coastline all at once.

• 押おし波なみと引ひき波なみのメカニズムを理り解かいすることが防ぼう災さいに役やく立だつ。

  Understanding the mechanism of advancing and receding waves helps with disaster prevention.