Dine out on Definition 1 of 2Pro Tip 1/3Occasional Treat Used when suggesting dining out as a break from routine or celebration, not a daily habit. Let's dine out this weekend to celebrate your promotion! Pro Tip 2/3Casual Phrasing More common in casual conversation, not for formal writing or formal invitations. We should totally dine out on Friday! Pro Tip 3/3Social Activity Implies enjoying a meal in a social context, can suggest the company is as important as the meal. We love to dine out with friends and catch up.