"大甩卖" 的英文是 "big sale"。这个短语来源于商业活动，通常指商家为了促销商品或清仓出售而进行的大规模降价销售活动。

例句：

这家商店正在举行大甩卖，所有商品都打折。(This store is having a big sale and everything is discounted.)

别错过了本周末的大甩卖，有许多优惠和折扣。(Don't miss the big sale this weekend, with lots of deals and discounts.)

如果你想买新衣服，现在是最好的时机，因为很多商店都在举行大甩卖。(If you want to buy new clothes, now is the best time because many stores are having big sales.)