gaoo
A fierce, powerful roar of a large predator like a lion or bear. Often used playfully by children pretending to be monsters, and in anime for dramatic effect.
💡A child playing pretend — 'I'm a lion! Gaoo!' or at the zoo — 'The lion just roared gaoo!'
ライオンががおーとほえた。
The lion roared gaoo.
The lion opened its huge mouth and roared ___ at the crowd.
ライオンが大きな口を開けて○○とほえた。