Definition of ail verb from the Oxford Advanced American Dictionary

     

    ail

     verb
    verb
    NAmE//eɪl//
     
    Verb Forms present simple I / you / we / they ail
     
    he / she / it ails
     
    past simple ailed
     
    -ing form ailing
     
     
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  1. 1ail something (formal) to cause problems for someone or something They discussed the problems ailing the steel industry.
  2. 2 ail somebody (old use) to make someone sick What is ailing you?
See the Oxford Advanced Learner's Dictionary entry: ail