不ふ沈ちん空くう母ぼ

noun

unsinkable aircraft carrier

Military term for a large warship or island base that functions as an aircraft carrier and is considered unsinkable.

• アメリカ海かい軍ぐんはその島しまを不ふ沈ちん空くう母ぼとして利り用ようした。

  The U.S. Navy used that island as an unsinkable aircraft carrier.