遣り損なう

やりそこなう

to fail; to slip up; to make a botch job (of)

Also written やり損なう

Meaning

v5u
to fail; to slip up; to make a botch job (of)

Example sentences

注意しなくては駄目だよ、さもないとまたやり損なうよ。

You've got to be careful or else you'll miss it again.