Buy-in (noun)

1. A financial term used to describe an investment made to purchase a controlling interest in a company or asset.
2. A situation in which an individual or group agrees to participate in or support an idea, plan, or project.

Origin:

From buy (to acquire in exchange for money) + in (to invest or participate in).

Examples:

1. He made a buy-in to the company, becoming a majority shareholder.
2. The buy-in allowed the investors to have a say in the company's direction.
3. The buy-in was necessary for the company to secure funding.
4. The team leader struggled to get buy-in from the team members for the new project.
5. The buy-in from the community was crucial for the success of the initiative.