端はしから端はしまで

expression

from one end to the other; thoroughly; completely

Emphasizes covering the entire extent of something, both physically and figuratively. Often used with verbs like 読む, 調べる, 知る.

• 彼かれはその本ほんを端はしから端はしまで読よんだ。

  He read the book from cover to cover.

• この町まちのことは端はしから端はしまで知しっている。

  I know this town inside out.