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Related to round out: round up, overzealousness, deputise, ameliorative
round something out
to complete or enhance something. We will round the evening out with dessert at a nice restaurant. They rounded out the meal with dessert.
round out somethingalso round something out
to complete something The visit to the ancient temple was the perfect thing to round out our vacation. It's a good article but I would have rounded it out with a paragraph about repairing the damage from the earthquake.
1. See round off, def. 2.
2. Grow or develop to a round form, as in The tree was spindly when first planted, but it has since rounded out nicely. [c. 1900]
To bring some event or achievement to a pleasing conclusion or completeness, especially by enhancing it: This last song will round out our performance for this evening. Let's round the meal out with a glass of wine.