• WordNet 3.6
    • v outroar roar louder than
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Webster's Revised Unabridged Dictionary
    • v. t Outroar To exceed in roaring.
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Century Dictionary and Cyclopedia
    • outroar To exceed in roaring.
    • outroar To roar; roar out.
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Chambers's Twentieth Century Dictionary
    • v.t Outroar owt-rōr′ (Shak.) to exceed in roaring
    • n Outroar an uproar
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In literature:

Each was trying to outroar the other.
"A Diversity of Creatures" by Rudyard Kipling
If he could outroar his opponent, he always considered the victory as his.
"The Rules of the Game" by Stewart Edward White
Joshua could outroar Bottom the weaver by two or three miles.
"Bible Romances" by George W. Foote
The thunder peals from Sugar Loaf and Corcovado at times outroared those of the guns.
"With the Battle Fleet" by Franklin Matthews

In news:

Back in the late '90s, fire-breathing battle rapper Rah Digga was the only sidekick in Busta Rhymes' Flipmode Squad who could outroar the dungeon dragon himself.