Usage Note
Rugir is used for the roar of large cats (lions, tigers) and, by extension, of thunder, engines, or an angry crowd. It is a regular -ir verb. The related noun is rugissement (a roar), and the image of a roaring lion (lion rugissant) is a common heraldic and literary motif in French.
Examples
"Le lion rugit dans la savane."
Natural Translation
The lion roared on the savannah.

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