前ぜん約やく

noun

previous engagement; prior promise

Refers to a prior commitment, appointment, or promise that may affect current plans. Often used when declining or rescheduling.

• 前ぜん約やくがあるので、今こん回かいは参さん加かできません。

  I have a prior engagement, so I can't attend this time.

• 前ぜん約やくを優ゆう先せんさせていただきます。

  I will give priority to my previous promise.