しそこなう

godan verb (-u), transitive verb

fail to do; make a mistake in doing; miss doing

Attaches to the continuative form of a verb to express failing to do that action, making a mistake in doing it, or missing the chance to do it. The action is typically intentional but the outcome is unsuccessful.

• 電でん車しゃに乗のりそこなった。

  I missed the train (failed to catch it).

• 大だい事じなところを聞ききそこなってしまった。

  I failed to catch the important part (of what was said).