仕し損そんじる

ichidan verb, transitive verb

blunder; fail; make a mistake

Used when someone messes up an action or fails to do something properly. Often implies a careless or clumsy mistake.

• 大だい事じな書しょ類るいを書かき損そんじて、もう一いち度どやり直なおした。

  I messed up writing the important document and had to redo it.

• 彼かれは簡かん単たんな計けい算さんをし損そんじて、みんなに笑わらわれた。

  He blundered on a simple calculation and was laughed at by everyone.