Definition of iron adjective from the Oxford Advanced American Dictionary

 

iron

 adjective
adjective
NAmE//ˈaɪərn//
 
[only before noun]
 
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  • very strong and determined She was known as the “Iron Lady.” a man of iron will
  • Idioms
    an iron fist/hand
     
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    if you use the words an iron fist/hand when describing the way that someone behaves, you mean that they treat people severely They promised that the army would strike with an iron fist at any resistance. The iron hand approach seems to work best with this age group.
    See the Oxford Advanced Learner's Dictionary entry: iron