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English definition of “hang on/upon sth”

hang on/upon sth

(DEPEND ON) phrasal verb with hang     /hæŋ/ verb
to depend on something: The safety of air travel hangs partly on the thoroughness of baggage checking.Essential or necessary
(Definition of hang on/upon sth (DEPEND ON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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