とっぷり

adverb, adverb taking the 'to' particle

completely; fully; entirely

Mimetic adverb emphasizing total immersion or thoroughness, often with verbs like 浸かる (soak) or 暮れる (grow dark).

• 温おん泉せんにとっぷりと浸つかって疲つかれを癒いやした。

  I soaked completely in the hot spring and relieved my fatigue.

• 日ひがとっぷりと暮くれて、あたりは真まっ暗くらになった。

  The sun set completely and it became pitch dark around.