フーフー

フーフー, ふうふう, ふーふー, フウフウ, フゥフゥfuufuu

adverb · suru verb

1. blowing repeatedly (e.g. to cool something down)
2. huffing and puffing
3. puffing and panting
4. gasping
5. struggling (with work, studies, etc.)
6. having difficulty

Study it in Yanamino