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To add to and complete something, enhancing it in the process. A noun or pronoun can be used between "round" and "out." Let's round out the evening with a sunset walk on the beach. The singer's solo rounded out the performance really well.
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.
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.