What is Lost ?
Lost is (adj) to be lost to end up not knowing where you are Did you bring a map? I think we’re lost! to get lost not to know where you are He’s hopeless, he got lost walking from Oxford Circus to Piccadilly. They should be back by now – do you think they’ve got lost? get lost! go away! (slang) When she asked him for money he told her to get lost.
source: Easier English, Student Dictionary Upper Intermediate Level