noun
year-end sales battle; year-end shopping season
Refers to the intense competition among retailers during the year-end shopping period, typically from late November through December.
年末商戦が始まると、どの店も大幅な値引きを行う。
When the year-end sales battle begins, every store offers deep discounts.
今年の年末商戦は、オンライン販売がさらに伸びた。
Online sales grew even more during this year's year-end shopping season.
Compound of 年末 (year-end) and 商戦 (sales competition). The term 商戦 itself is a relatively modern coinage reflecting commercial rivalry.