アップダウン

noun

ups and downs; up-and-down

Wasei-eigo from English 'up down'. Used for fluctuations, alternating states, or vertical movement. Often appears in compound terms like アップダウンが激しい (wild fluctuations) or in sports/tech contexts.

wasei-eigo (Japanese-coined English), from up down

• 最さい近きんの株かぶ価かはアップダウンが激はげしい。

  Stock prices have been fluctuating wildly lately.

• このコースはアップダウンが多おおくて走はしりにくい。

  This course has a lot of ups and downs, making it hard to run.