used to describe a stupid person
something that you say when you think someone is stupid
when someone does not react because they are thinking about something else
have a brain, but not using it
used to tell that someone lacks cleverness or alertness
I tried all to understand him, but the lights are on but nobody is home.
John has no idea about this – the lights are on but nobody’s home.
Lilly studied about interior designing but the lights are on nobody is home.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.