Kingmaker (noun)

A person or group that has the power to determine who will become a king or queen or who holds significant influence in the selection of a leader.

Origin:

The term "kingmaker" has been used since the 16th century, it refers to a person or group that has the power to determine who will become a king or queen or who holds significant influence in the selection of a leader.

Examples:

1. He was seen as the kingmaker in the upcoming election, as his endorsement carried a lot of weight.
2. She played the role of kingmaker in the last leadership contest.
3. The party kingmakers were meeting to decide on the next candidate.
4. The kingmaker's support was crucial for the candidate to win the election.
5. He was considered one of the most powerful kingmakers in the country.