equalizer
n. B2 Upper Intermediate US //ˈikwəˌɫaɪzɝ// equal·iz·er
n. a device or tool that makes different things the same. In music, it helps balance the volume of different sounds. In sports, it is a rule that makes the game fair for everyone.
n. a device or mathematical tool used to balance or adjust levels. In a sporting context, it refers to a rule or action that neutralizes an advantage held by one side.
The DJ used the equalizer to fix the bass sound.
The referee called a foul to act as an equalizer in the final minutes of the match.
By adjusting the equalizer on the mixing board, the engineer ensured that the high-frequency vocals were not drowned out by the low-end percussion.
From equalize + -er (nominal suffix: agent noun).