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English definition of “fasten on/upon sth”

fasten on/upon sth

phrasal verb with fasten     /ˈfɑː.sən/ US  /ˈfæs.ən/ verb
to give attention to something, because it is of special interest or often because you think it is the cause of a problem: The tabloid newspapers have fastened on popular psychology. My mind fastened on his admission that he was an agent.Excited, interested and enthusiastic
(Definition of fasten on/upon sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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