一起喝酒的英文说法是"have a drink together"。这个短语的来源可能源自于人们在一起喝酒时会有更多的互动和沟通，因此有"一起"这个词。例句：

Let's have a drink together tonight. (我们今晚一起喝一杯吧。)

It's always more fun to have a drink together with friends. (和朋友一起喝酒总是更有意思。)

Let's toast to our friendship and have a drink together. (为我们的友谊敬酒，一起喝酒吧。)