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English definition of “depend on/upon sb/sth”

depend on/upon sb/sth

verb [I] uk phrasal verb with depend   /dɪˈpend/ us  

(TRUST)

B2 to trust someone or something and know that that person or thing will help you or do what you want or expect him, her, or it to do: You can always depend on Michael in a crisis. [+ to infinitive] I'm depending on you to keep your promise. [+ -ing verb] You can't always depend on the trains arriving on time.humorous You can depend on Jane to be late (= she is always late).

(SUPPORT)

B2 to need something, or need the help and support of someone or something, in order to live or continue as before: Charities depend on people supporting their activities. The country depends heavily on foreign aid. Elaine depends upon Bob completely for her happiness.
(Definition of depend on/upon sb/sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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