What does 鎖国 mean?
鎖国 is a Japanese noun meaning “national isolation” in English. It can also be translated as “sakoku” depending on context. It is written as 鎖国 in kanji, さこく in hiragana, and sakoku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
まぁ、日本も鎖国していたわけだしなあ。
Well, after all Japan also cut itself off from the world.