Noun
A switch or pedal controlled by the foot.
An instance of switching one's feet, such as in a sport.
Source: en.wiktionary.orgA footswitch pedal such as the "A/B" pedal routes a guitar signal to an amplifier or enables a performer to switch between two guitars, or between two amplifiers. Source: Internet
An all-new digital effects processor with 16 presets supplies rich reverbs, lush delays, and fat chorusing and includes a dedicated send and return, as well as a bypass footswitch jack (footswitch optional). Source: Internet
Footswitch A footswitch is a rugged switch which is operated by foot pressure. Source: Internet
Typical simple stompboxes have a single footswitch, one to three potentiometers for controlling the effect, and a single LED that indicates if the effect is on. Source: Internet