言いい損そこない

noun

slip of the tongue; verbal mistake; gaffe

Refers to an unintentional error in speaking, such as misspeaking, using the wrong word, or making an embarrassing remark.

See also: 言い損なう

• 会かい議ぎで言いい損そこないをしてしまい、恥はずかしかった。

  I made a slip of the tongue during the meeting and felt embarrassed.

• 彼かれの言いい損そこないが原げん因いんで、誤ご解かいが生しょうじた。

  His verbal mistake caused a misunderstanding.