すっぽ抜ぬける

ichidan verb

slip out; come off

Describes something suddenly slipping out of a grip, socket, or fitting, often with a popping sensation.

• 手てが滑すべって、スマホがすっぽ抜ぬけた。

  My hand slipped and the smartphone popped out of my grip.

• プラグがコンセントからすっぽ抜ぬけている。

  The plug has come loose from the outlet.

ichidan verb

completely forget; slip one's mind

Used when something is entirely forgotten, as if it has slipped out of one's memory. Often with 頭から or 記憶から.

• 約やく束そくが頭あたまからすっぽ抜ぬけていた。

  The appointment had completely slipped my mind.