在英语中，与同事聚餐可以用以下几种表达方式来表示：

have a meal with colleagues：与同事一起吃饭
have lunch/dinner with coworkers：与同事一起吃午/晚餐
go out to eat with colleagues：与同事一起外出吃饭

这些表达方式的来源都是来自于日常生活中的常用语。

下面是一些例句：

I'm going to have a meal with my colleagues at noon. 我将在中午与同事们一起吃饭。
I'm having lunch with my coworkers at the new restaurant down the street. 我将在街角的新餐厅和同事们一起吃午餐。
We're going out to eat with some of our colleagues after work. 我们将在下班后与一些同事一起外出吃饭。