The term "doth lunch" may sound old-fashioned and formal, but there are plenty of modern synonyms for this phrase. One common alternative is simply "has lunch," which is a more straightforward way of expressing the same idea. Other possibilities include "takes a lunch break," "grabs lunch," "eats lunch," or "dines at midday." Depending on the context, you might also use more specific terms like "orders takeout," "meets for a business lunch," or "packs a lunchbox." Regardless of the specific phrasing, the important thing is conveying the idea that someone is taking time out of their day to eat a midday meal.