Noun
1. rejection
2. dismissal
3. prohibition
4. proscription
5. embargo
6. ban
7. interdict
8. check
10. red light
Verb
11. reject
14. dismiss
15. prohibit
16. forbid
17. interdict
18. proscribe
19. disallow
20. embargo
21. ban
22. rule out
23. say no to
24. kill
25. put the kibosh on
26. give the thumbs down to
27. give the red light to