1. a person who makes a pledge or promise
2. a person who gives money or support to a cause or organization

Examples

• Each pledger at the charity event committed to donating at least $100.
• The pledger signed the document promising to support the scholarship fund.
• As a pledger to the environmental campaign, she felt responsible for attending meetings.
• The organization thanked every pledger who contributed to their fundraising goal.
• He became a pledger after hearing about the community center’s financial needs.
• The pledger fulfilled her commitment by volunteering twenty hours each month.