Miles away
Meaning
Distracted or not present mentally.
Usage
Used when someone seems lost in thought.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Impression of being physically distant from the scene.
Appeared in early novels describing dreamers and daydreamers.