1. a serious promise or commitment to do something
2. something given as security for a loan or debt
3. a person who has promised to join a fraternity or sorority
Usage: college

1. to make a serious promise or commitment
2. to give something as security for a loan

Examples

• She made a pledge to donate money to charity every month.
• The candidates signed a pledge to support environmental protection.
• He put his watch up as a pledge for the loan.
• The new pledge was excited to join the fraternity.
• They pledged their support for the new policy.
• The company pledged to reduce carbon emissions by 50%.
• She pledged her jewelry to secure the mortgage.