Drown Out Meaning

(idiomatic) To cover, obscure, or hide by being louder than.

Example:   He uses the music to drown out other noises around him.
2014, Daniel Taylor, England and Wayne Rooney see off Scotland in their own back yard (in The Guardian, 18 November 2014)[1]
  Charlie Mulgrew could easily have been shown two yellow cards by a stricter referee and amid all the usual Anglo-Scottish pleasantries, the two sets of fans put an awful lot of effort into trying to drown out one another’s national anthems.