隠かくし部屋べや

noun

hidden room; secret chamber

A room concealed from view or kept secret, often for privacy, security, or illicit purposes.

• この古ふるい屋や敷しきには隠かくし部べ屋やがあるらしい。

  There seems to be a hidden room in this old mansion.

• スパイは隠かくし部べ屋やで密みつ談だんした。

  The spies held a secret meeting in the hidden room.