井せい底てい

noun

well bottom; narrow place

Literally the bottom of a well; also used figuratively for a confined, narrow space or limited perspective. Often appears in the idiom 井底の蛙 (a frog in a well).

• 井せい底ていの蛙かわず、大たい海かいを知しらず。

  A frog in a well knows nothing of the great ocean.

• 彼かれは井せい底ていのような狭せまい世せ界かいで育そだった。

  He grew up in a narrow world like the bottom of a well.