It's time for dinner. Let's have dinner together.

该吃晚餐了，我们一起吃晚餐吧。

youdao

We were to have had dinner together yesterday evening, but he stood me up.

昨晚我们本应该一起用餐，但他失约了。

《柯林斯英汉双解大词典》

When will they have dinner together?

他们什么时候一起吃晚饭？

youdao

"I usually get together with a daughter and a granddaughter and we go out to dinner and exchange gifts.

VOA: special.2010.02.08

When they first were elected they lived in rooming houses and got together for dinner and shared ideas.

VOA: standard.2010.08.07

We arranged it so they could have lunch and dinner together in her room.

NEWYORKER: Beginners

The prince lived apart from his parents, visiting them once a week when they had dinner together.

ECONOMIST: Elizabeth Vining

Implementing three healthy family habits--eating dinner together, making sure they get enough sleep, and limiting TV--may help.

CNN: How to fight childhood obesity in 3 steps