The meaning of TOGGLE is a piece or device for holding or securing. How to use toggle in a sentence. A toggle key switches input from other keys on the keyboard between two different modes. The most frequent toggle key is Caps Lock, which switches the letter keys between lowercase and uppercase modes. What is Toggle Keys? Toggle Key is designed for people with vision loss and cognitive disabilities. When the toggle key is turned on, the computer emits a sound when the keys are pressed. Microsoft first introduced ToggleKeys with Windows 95. Keyboard The keyboard is an input device that ... Definition of toggle noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. TOGGLE definition: 1. a small bar of wood or plastic that is used to fasten something by being put through a hole or…. Learn more.