Tra từ pledge - Từ điển Oxford Advanced Learner 8th

pledge [pledge pledges pledged pledging] noun, verb BrE [pledʒ] NAmE [pledʒ]
noun
1. a serious promise
Syn: ↑commitment
•~ (of sth) a pledge of support
•~ (to do sth Will the government honour its election pledge not to raise taxes?
•~ (that…) Management has given a pledge that there will be no job losses this year.
2. a sum of money or sth valuable that you leave with sb to prove that you will do sth or pay back money that you owe

Word Origin:
Middle English (denoting a person acting as surety for another): from Old French plege, from medieval Latin plebium, perhaps related to the Germanic base of ↑plight (verb).

Example Bank:
•The party's election pledge was to cut income taxes by a third over the next five years.
•They recited the Pledge of Allegiance.
•manifesto pledges on greater public spending
•spending pledges given by the government
•The new leader demanded a pledge of loyalty from each of his allies.
•The new owners gave a pledge that there would be no job losses.
Idiom: ↑sign the pledge

verb
1. transitive to formally promise to give or do sth
•~ sth Japan has pledged $100 million in humanitarian aid.
•The government pledged their support for the plan.
•~ sth to sb/sth We all had to pledge allegiance to the flag (= state that we are loyal to our country).
•~ to do sth The group has pledged to continue campaigning.
•~ (that)… The group has pledged that they will continue campaigning.
2. transitive to make sb or yourself formally promise to do sth
Syn: ↑swear
•~ sb/yourself (to sth) They were all pledged to secrecy.
•~ sb/yourself to do sth The government has pledged itself to root out corruption.
3. transitive ~ sth to leave sth with sb as a ↑pledge (²)
4. intransitive, transitive (NAmE)to promise to become a junior member of a ↑fraternity or ↑sorority
•Do you think you'll pledge this semester?
•~ sth My brother pledged Sigma Nu.
Verb forms:

Word Origin:
Middle English (denoting a person acting as surety for another): from Old French plege, from medieval Latin plebium, perhaps related to the Germanic base of ↑plight (verb).

Example Bank:
•Japan pledged $100 million in humanitarian aid.
•Politicians of all parties pledged their support for the idea.
•The bill would require schoolchildren to pledge allegiance to the flag.
•The country pledged not to interfere in its neighbour's affairs.
•The government has pledged that it will not raise taxes.