二に重じゅう底ぞこ

noun

double bottom; false bottom; double sole; double hull

Refers to a second, often hidden, bottom layer in containers, ships, shoes, etc. Used in contexts like smuggling, insulation, or reinforcement.

• そのトランクには二に重じゅう底ぞこがあって、密みつ輸ゆ品ひんが隠かくされていた。

  The trunk had a false bottom where contraband was hidden.

• この船ふねは二に重じゅう底ぞこ構こう造ぞうで、安あん全ぜん性せいが高たかい。

  This ship has a double-bottom structure, making it very safe.