ichidan verb, transitive verb
Used when someone messes up an action or fails to do something properly. Often implies a careless or clumsy mistake.
大事な書類を書き損じて、もう一度やり直した。
I messed up writing the important document and had to redo it.
彼は簡単な計算をし損じて、みんなに笑われた。
He blundered on a simple calculation and was laughed at by everyone.