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English definition of “harm”

harm

noun [U]  /hɑrm/ us  
physical or other injury or damage: Missing a meal once in a while won’t do you any harm. Fortunately, she didn’t come to any harm when the car skidded. Maybe Jim can help you – there’s no harm in asking (= no one will be annoyed and you might benefit).
harm
verb [T]  /hɑrm/ us  
The tornado blew out the windows of a nearby school, but none of the children were harmed.
harmful
adjective  /ˈhɑrm·fəl/ us  
This group of chemicals is known to be harmful to the environment.
(Definition of harm from the Cambridge Academic Content Dictionary © Cambridge University Press)
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