How to say "flashing" in Japanese

• 点滅てんめつCommon
  noun, suru verb, transitive verb, intransitive verbCovers the literal sense of flashing: a light switching on and off repeatedly, as with signal lamps or indicator lights. This is the word for the visual phenomenon, not the climbing sense.
  バックミラーに赤あかいランプが点滅てんめつしているのが見みえた時ときは、ガックリきたね。↗

  I saw flashing red lights in my rear-view mirror and my heart sank.
• 一撃いちげきCommon
  noun, suru verb, transitive verbCovers only the climbing sense of flashing: summiting on the first attempt, often without prior knowledge of the route. For lights that blink, this is not the word you want.

Use 点滅 for the flashing or blinking of a light, and 一撃 for the climbing sense of flashing, that is, summiting a route on the first attempt.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 点滅てんめつswitching on and off (of a light)
• フラッシングflashing
• 雨仕舞いあまじまいwaterproofing (of a building)
• 一撃いちげきsummiting on the first attempt (oft. without prior knowledge about the route; in climbing)
• 水切りみずきりcutwater (of a ship)