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roar

2 noun
     
Related topics: Colours and Sounds
roar2 [countable]
1C a deep, loud noise made by an animal such as a lion, or by someone's voice [↪ growl]:
the roar of the crowd
He let out a roar of laughter.
2 a continuous loud noise, especially made by a machine or a strong wind:
the roar of the traffic

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