As a Noun: 1. The control on something such as a radio or heater that controls the amount of sound or heat being produced. 2. The amount of sound that a radio, TV, record player, CD player, etc., produces. English = volume. As a Verb or Adjective: 1. To adjust the controls on something such as a radio, lamp or heater so as to increase the amount of sound or heat being produced. English = turn up. 2. To adjust the controls on something such as a radio, lamp or heater so as to start sound, light or heat being produced. English = turn on.