(they) had dinner, (they) ate dinner
Vejo que estavam à vontade, jantaram.
I see they were comfortable, they had dinner.
— Ирония судьбы, или С легким паром! (1976)
Vocês já jantaram?
Have you already had dinner?
Onde vocês jantaram?
Where did you guys have dinner?
Tom e Maria jantaram mais cedo.
Tom and Maria had dinner earlier.
Já jantaram?
Have you had dinner yet?