What does straight up mean when ordering a drink?

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Tags

1. #would
2. #mixer
3. #might
4. #cocktail
5. #bourbon
6. #straight
7. #poured
8. #martini
9. #rocks
10. #glass
11. #means
12. #served
13. #order
14. #without
15. #chilled
16. #drink
17. #fashioned