基き石せき

noun

cornerstone; foundation stone

Refers to a stone laid at the corner of a building's foundation, often used in a ceremonial sense. Also used metaphorically for a fundamental element.

• 市し長ちょうが新あたらしい図と書しょ館かんの基き石せきを据すえた。

  The mayor laid the cornerstone of the new library.

• 教きょう育いくは社しゃ会かいの基き石せきである。

  Education is the cornerstone of society.