Definition of fell adjective from the Oxford Advanced American Dictionary

 

fell

 adjective
adjective
NAmE//fɛl//
 
see also fall(literary)
 
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  • very evil or violent
  • Idioms
    at/in one fell swoop
     
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    all at the same time; in a single action, especially a sudden or violent one If the new law is passed, it will remove freedom of the press in one fell swoop.
    See the Oxford Advanced Learner's Dictionary entry: fell