Used to tell somebody to go away or leave one alone.(interjection)
To lose one's way.(verb)
To be absent, to seem to be absent.(verb)
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Use "get lost" in a sentence
"I suppose there might be people so wrapped up in the memories of their past lives, so full of brooding and self-paralyzing scruples about themselves, that the afterworld becomes a place they get lost in, clinging to the same place in their memory, the same obsessive thoughts."
"We get lost almost straight away, and it is entirely the fault of my romantic desire to try to find a track across country to the next village, Myczkow, rather than take a short cut along the road."
"I could close my eyes and let myself get lost in Cory Wheeler."