to be defeated by someone
to be lost to the world means that you are so engrossed in a task that you don’t realise what is going on around you
to be lost to the ages means that something has been forgotten over time
to no longer be affected by something
I cannot believe that we lost to their team on Saturday. We practised so hard.
She lost to her sister in the tennis match. She just wasn’t as good as Lucy.
She loves that television show so much that she is lost to the world for the whole hour that it is on.
The man used to be a brilliant scientist, but since his accident he has been lost to the world.
The old, time consuming way of printing has been lost to the ages.
After he treated her so badly she was completely lost to him.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.