落石

• Reading: らくせき
• Romaji: rakuseki
• Kanji breakdown: 落 (raku) — fall, drop; 石 (seki/ishi) — stone, rock
• Pronunciation: /ɾa.kɯ.se.ki/

Meaning

Falling rocks; rockfall. Rocks or boulders that detach from a cliff, mountainside, or cut slope and fall onto roads, trails, or inhabited areas below.

A compound noun and する-verb used in mountain safety, civil engineering, and disaster reporting. Japan's steep terrain and heavy rainfall make 落石 a serious hazard on mountain roads and hiking trails. Warning signs (落石注意) are common in mountainous areas, and protective nets and concrete barriers are widely installed. Heavy rain, earthquakes, and freeze-thaw cycles are the primary triggers.

Examples

1. 大雨の翌日、山間の道路で落石があり、車線の半分以上が塞がれた。 The day after heavy rain, a rockfall blocked more than half the lanes on a mountain road.
2. 落石注意の標識が立てられている区間では、速度を落として走行することが重要だ。 On sections where falling-rock warning signs are posted, it is important to reduce speed.
3. 崖の上から突然落石が転がり落ちてきて、直前の車が急停車した。 Rocks suddenly tumbled down from the cliff face, and the car immediately in front came to an emergency stop.

Usage Guide

Context: mountain safety, road hazards, disaster management

Tone: cautionary

Origin & History

Sino-Japanese compound. 落 (raku) means to fall, and 石 (seki/ishi) means stone or rock. The compound directly and unambiguously describes a rock falling from an elevated position.

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal