|pledge /ˈplɛʤ/ verb|
inflected forms: pledges; pledged; pledging
1 [with object] : to formally promise to give or do (something) • Her family pledged $100,000 toward the construction of a new school. • He called to pledge money to the charity. • We’ve all pledged (our) loyalty/support/allegiance to the organization. • Every morning, wepledge allegiance to the flag. • teenagers who have pledged not to start smoking • During his campaign, he pledged that he would not raise taxes.
2 [with object] : to cause (someone) to formally promise something• She pledged herself to silence. [=she promised that she would not say anything] • The chefs are pledged to keep the restaurant’s special recipe a secret.
3 [with object] : to give (something) as a way to show that you will keep your promise to someone • He pledged his paintings as collateral/security for a loan.
4 US : to promise to join (a college fraternity or sorority) [withobject] • She pledged the sorority as a freshman. [no object] • A few of his friends pledged to/with fraternities.