出来吃饭该怎么说英语

To invite someone to eat a meal in English, you can say:
"Would you like to join me for a meal?"
"I'm going to grab a bite to eat. Would you like to come along?"
"Do you want to get lunch (or dinner) together?"
"I was thinking of trying that new restaurant down the street. Do you want to come with me?"
You can also simply say "Let's go out to eat" or "Let's grab a bite to eat."
Keep in mind that in English, it is common to use the word "eat" to refer to a meal, regardless of whether it is lunch or dinner. So you can use the phrase "eat a meal" or "have a meal" to refer to any meal of the day.