BOYCOTT: to refuse to buy a product or take part in an activity as a way of expressing strong disapproval.
1.Extort: to get something by force or threats,or with difficulty
2.Underwrite: if a bank ot other organization underwrites an activity,it gives it financial support and takes responsibility for paying any costs if it fails.
3.Underbid:to offer to do work or provide a service for a lower price than someone else.
4.Stipulate: to say exactly how something must be or must be done
5.Patronize: to speak to or behave towards someone as if they are stupid or not important.
5.Patronize
I thinh the fifth one is the most nearly opposite in meaning to the word in capital letters.