verb (used without object)

  1. to utter a loud, deep cry or howl, as in excitement, distress, or anger.
  2. to laugh loudly or boisterously: to roar at a joke.
  3. to make a loud sound or din, as thunder, cannon, waves, or wind.
  4. to function or move with a loud, deep sound, as a vehicle: The automobile roared away.
  5. to make a loud noise in breathing, as a horse.

verb (used with object)

  1. to utter or express in a roar: to roar denials.
  2. to bring, put, make, etc., by roaring: to roar oneself hoarse.


  1. a loud, deep cry or howl, as of an animal or a person: the roar of a lion.
  2. a loud, confused, constant noise or sound; din; clamor: the roar of the surf; the roar of lively conversation from the crowded party.
  3. a loud outburst: a roar of laughter; a roar of approval from the audience.

verb (mainly intr)

  1. (of lions and other animals) to utter characteristic loud growling cries
  2. (also tr) (of people) to utter (something) with a loud deep cry, as in anger or triumph
  3. to laugh in a loud hearty unrestrained manner
  4. (of horses) to breathe with laboured rasping soundsSee roaring (def. 6)
  5. (of the wind, waves, etc) to blow or break loudly and violently, as during a storm
  6. (of a fire) to burn fiercely with a roaring sound
  7. (of a machine, gun, etc) to operate or move with a loud harsh noise
  8. (tr) to bring (oneself) into a certain condition by roaringto roar oneself hoarse


  1. a loud deep cry, uttered by a person or crowd, esp in anger or triumph
  2. a prolonged loud cry of certain animals, esp lions
  3. any similar noise made by a fire, the wind, waves, artillery, an engine, etc
  4. a loud unrestrained burst of laughter

Old English rarian “roar, wail, lament, bellow, cry,” probably of imitative origin (cf. Middle Dutch reeren, German röhren “to roar;” Sanskrit ragati “barks;” Lithuanian reju “to scold;” Old Church Slavonic revo “I roar;” Latin raucus “hoarse”). Related: Roared; roaring.


late 14c., from roar (v.) and Old English gerar.

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