Definition of pledge verb from the Oxford Advanced American Dictionary

     

    pledge

     verb
    verb
    NAmE//plɛdʒ//
     
    Verb Forms present simple I / you / we / they pledge
     
    he / she / it pledges
     
    past simple pledged
     
    -ing form pledging
     
     
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  1. 1[transitive] to formally promise to give or do something pledge something Japan has pledged $100 million in humanitarian aid. The government pledged their support for the plan. pledge something to somebody/something We all had to pledge allegiance to the flag (= state that we are loyal to our country). pledge to do something The group has pledged to continue campaigning. pledge (that)… The group has pledged that they will continue campaigning.
  2. 2[transitive] to make someone or yourself formally promise to do something synonym swear pledge somebody/yourself (to something) They were all pledged to secrecy. pledge somebody/yourself to do something The government has pledged itself to root out corruption.
  3. 3[transitive] pledge something to leave something with someone as a pledge
  4. 4 [intransitive, transitive] to promise to become a junior member of a fraternity or sorority Do you think you'll pledge this semester? pledge something My brother pledged Sigma Nu.
See the Oxford Advanced Learner's Dictionary entry: pledge