門もん戸こを閉とざす

expression, godan verb (-su)

close the door (to); shut out; exclude

Often used figuratively for shutting out foreign influence, new ideas, or people; can also refer to literal closing of gates or doors.

• その国くには長ながい間あいだ、外がい国こくに対たいして門もん戸こを閉とざしていた。

  For a long time, that country closed its doors to foreign nations.