pour
serve
Rocks refers to ice cubes. A drink served on the rocks means that it is poured over ice cubes, and served with the ice cubes in the drink.
18 to serve 21 to drink
Technology
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Tea
Lemonade
Cups that you serve a particular drink in.
Willingness to serve means that you are willing to serve
When it's hot outside
serve water as a drink not wine
you can be 18 to serve unopen containers but you have to be 21 to serve open containers