make it (something)

1. An expression used when one wants to change something that one has just said. Let's have the meeting at 12:30. Actually, make it 2:30; I have another meeting scheduled at lunch time.

2. To do something in a particular manner. Often used as an imperative. Write a headline for this story, and make it quick, we're on deadline.

3. An expression used when ordering something, especially at a bar or restaurant. Make it a double, Smitty, I've had a hard day. I'll have a number three, and make it a combo, please.

make it a double

Make me a drink with twice the amount of alcohol typically used. I'll take a vodka on the rocks, and make it a double—it's been a rough week.

make mine a double

Make the drink I order twice as strong as normal. A: "What'll you have, Sam? Whiskey on the rocks?" B: "Yeah, but make mine a double—it's been a really rough day."