lost Definition in Cambridge British English Dictionary
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Definition of "lost" - British English Dictionary

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lostadjective

uk   /lɒst/  us   /lɑːst/

lost adjective (PLACE UNKNOWN)

A2 not knowing where you are and how to get to a place: I got lost in the New York subway system. You look lost - can I help you?B1 If something is lost, no one knows where it is: Things tend to get lost when you move. Lost: black cat with white paws. Mikey turned up with the lost book.
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lost adjective (CONFUSED)

C1 not confident and not knowing what to do in a particular situation: It was his first day in the office and he seemed a little lost.

lost adjective (ATTENTION)

be lost in sth giving so much attention to what you are doing that you are not conscious of anything else that is happening around you: Ann was completely lost in her book.
(Definition of lost from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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