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Definition of harm verb from the Oxford Advanced American Dictionary

  

harm

 verb
verb
NAmE//hɑrm//
 
harm somebody/somethingVerb Forms present simple I / you / we / they harm
 
he / she / it harms
 
past simple harmed
 
-ing form harming
 
 
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  •  to hurt or injure someone or to damage something He would never harm anyone. Pollution can harm marine life. These revelations will harm her chances of winning the election. Thesaurusdamage
    • hurt
    • harm
    • impair
    These words all mean to have a bad effect on someone or something.
    • damage to cause physical harm to something, making it less attractive, useful, or valuable; to have a bad effect on someone or something's health, happiness, or chances of success:The fire badly damaged the town hall. emotionally damaged children
    • hurt (somewhat informal) to have a bad effect on someone or something's life, health, happiness, or chances of success:Hard work never hurt anyone.
    • harm to have a bad effect on someone or something's life, health, happiness, or chances of success:Pollution can harm marine life.
    damage, hurt, or harm?
    • Hurt is slightly less formal than damage or harm, especially when it is used in negative statements:It won't hurt him to have to wait a bit. It won't damage/harm him to have to wait a bit.Harm is also often used to talk about ways in which things in the natural world, such as wildlife and the environment, are affected by human activity.
    • impair (somewhat formal) to damage someone's health, abilities, or chances:Even one drink can impair driving performance.
    Patterns
    • to damage/hurt/harm/impair somebody's chances
    • to damage/hurt/harm somebody's interests/reputation
    • to damage/harm/impair somebody's health
    • to seriously/greatly damage/hurt/harm/impair somebody/something
    • to badly/severely damage/hurt/impair somebody/something
  • Idioms
    not harm/touch a hair on somebody's head
     
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    to not hurt someone physically in any way
    See harm in the Oxford Advanced Learner's Dictionary