As a Noun: 1. A loud noise or sound, especially one that is at the lower end of the frequency spectrum (ie, very bass) because it is more likely to be felt by a deaf person, rather than actually heard. As a Verb or Adjective: 1. For the level of a sound to be very high, for example the sound of thunder or the sound of your voice when you shout. English = (be) loud, (be) noisy.