High gear is a term that is often used to describe a situation where things are moving fast or at an intense pace. Some common synonyms for high gear include top speed, maximum capacity, overdrive, full throttle, and high octane. These terms are often used in contexts such as driving, athletics, or work to convey a sense of urgency or rapid progress. Other synonyms that can be used to describe high gear include fast lane, turbocharged, accelerated, and hyperdrive. No matter which term is chosen, they all convey a sense of moving forward quickly with energy and enthusiasm.