すっぽかす

godan verb (-su), transitive verb

leave undone; neglect; break (a promise); stand up

Colloquial verb for deliberately failing to do something one should do, such as skipping a task, breaking an appointment, or standing someone up. Often carries a casual, slightly irresponsible tone.

• 彼かれは約やく束そくをすっぽかして、来こなかった。

  He broke his promise and didn't come.

• 宿しゅく題だいをすっぽかして遊あそびに行いった。

  I neglected my homework and went out to play.

• デートをすっぽかされた。

  I was stood up on a date.