Foundation
Cornerstone
noun
The kanji and the word are exactly the same. That means they share meanings as well.
A foundation is made of stone (いし). And it holds up an entire zoo A (ずえ) but none of Zoo B. Zoo B will fall apart when an earthquake hits.
ここにいる人は皆、総合格闘技の礎を築いた故人の死を悼んでいると思います。
I think everyone here is mourning over the deceased who laid the foundation of mixed martial art.
手塚治虫は日本文化の礎となった人物と考えていいと思います。
I think it is safe to say that Osamu Tezuka is a cornerstone of Japanese culture.
大変だ。お城の礎となる石が誰かに壊されてしまった。一刻も早く避難しないと城が崩れるぞ！
Oh, no. Someone broke the stone that forms the foundation of the castle. If we don't evacuate as quickly as possible, the castle will collapse!
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.