タンス預よ金きん

noun

mattress money; cash kept at home

Refers to money saved privately at home, often in a drawer or under a mattress, instead of being deposited in a bank. Commonly used in economic contexts discussing unproductive savings.

• 日本にほんではタンス預よ金きんが数すう十じゅっ兆ちょう円えんあると言いわれている。

  It is said that there are tens of trillions of yen in mattress money in Japan.

• 祖そ母ぼは銀ぎん行こうを信しん用ようせず、タンス預よ金きんをしている。

  My grandmother doesn't trust banks and keeps her savings at home.