Meaning of “be lost without sb/sth” in the English Dictionary

british dictionary

"be lost without sb/sth" in British English

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be lost without sb/sth

C1 to be unable to live or work without someone or something:

I'm lost without my computer.
I'd be lost without you.

(Definition of “be lost without sb/sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)