The term TRUMPET MUFFLER is composed of two words. The first word, TRUMPET, refers to a brass instrument that is used to produce sound by vibrating the lips against a cup-shaped mouthpiece. The second word, MUTE, is a four-letter word meaning to reduce or deaden the sound of something. Therefore, TRUMPET MUFFLER can be defined as a device used to reduce the sound of a TRUMPET. It is typically made of a material such as felt or rubber and is placed over the bell of the TRUMPET to reduce the volume of the sound.