すっと
  スッと
  スーッと
  すうっと
  adverb (fukushi)
  noun or participle which takes the aux. verb suru
  onomatopoeic or mimetic word
  [スーッと and すうっと are more emphatic]
  straight
  quickly
  directly
  all of a sudden
  onomatopoeic or mimetic word
  quietly
  gently
  softly
  noun or participle which takes the aux. verb suru
  to feel refreshed
  to feel satisfied
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