The rise and fall or fluctuations of something; often used for stock prices, exchange rates, or other market movements.
株価の騰落が激しく、投資家は注意している。
Stock price fluctuations are volatile, and investors are being cautious.
為替の騰落を毎朝チェックしている。
I check exchange rate fluctuations every morning.
経済指標の発表で市場の騰落が起きた。
The announcement of economic indicators caused market fluctuations.