損なう
1
to harm;to hurt;to injure;to damage;to spoil;to mar;to ruin
彼はその手紙に返事を出し損なった。
He failed to answer the letter.
2
to fail to do;to do amiss;to miss one's opportunity to do
after the -masu stem of a verb
3
to almost do;to come close to doing
after the -masu stem of a verb
Other forms
害う 【そこなう】 (rarely used kanji form) · 損う 【そこなう】 (irregular okurigana usage)