ぬっと

ぬっと, ぬうっと, ヌッと, ヌウッとnutto

adverb

1. suddenly (appear, stick out, etc.)
2. abruptly (happen)
3. unexpectedly
4. looming (e.g. out of the dark)
5. (stand) still and expressionless
6. imposingly
7. menacingly
8. suddenly (stand up)

Study it in Yanamino