next door
next door {adv.} or {adj.}
1. In or to the next house or apartment.
He lived next door to me.
She telephoned next door to ask about John.
The house next door caught fire.
2. Very close. — Used with "to".
The sick man was next door to death.
Printing secrets about our country's missiles is next door to treason.
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Source: A Dictionary of American Idioms
