The term POWER-INCREASING GADGET can be summarized as a device that increases the power of something. The crossword solution for this term is AMP, which stands for 'AMPLIFIER'. An AMPLIFIER is an electronic device that increases the strength of a signal, such as an audio signal, by boosting its voltage, current, or power. Amplifiers are used in many different applications, such as in sound systems, radio transmitters, and even in medical equipment.