Wiktionary
dine out
vb. (context intransitive English) To have dinner outside one's house.
WordNet
Usage examples of "dine out".
One grows tired of hotel food, and when we do dine out it is usually to one or another of the Apgar houses where the meals stick, as they say in these parts, to the ribs but no more.
Woodhouse should dine out, on the 24th of December) had been spent by Harriet at Hartfield, and she had gone home so much indisposed with a cold, that, but for her own earnest wish of being nursed by Mrs.
When we meet -- we do meet occasionally, when we dine out together, or go down to the Duke's -- we tell each other the most absurd stories with the most serious faces.