Godan verb with 'u' ending, Transitive verb
to say incorrectly; to use the wrong words; to make a slip of the tongue
ちょっとした言いそこないが思いがけない結果をもたらすことが多い。A slip of tongue will often lead us to unexpected results. to forget to say; to miss one's chance to say
Also written 言損なう【いいそこなう】、言いそこなう【いいそこなう】