noun
price war; cutthroat competition
Refers to a fierce battle over pricing, often between businesses trying to undercut each other.
スーパーの乱売合戦で、牛乳がいつもより安くなっている。
Due to the price war among supermarkets, milk is cheaper than usual.
携帯電話業界の乱売合戦は、消費者にとってはありがたい。
The cutthroat competition in the mobile phone industry is a blessing for consumers.
Compound of 乱売 (ranbai, 'dumping, selling at a loss') and 合戦 (kassen, 'battle, fight').