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in high gear
*in high gear
1. [of a machine, such as a car] set in its highest gear, giving the greatest speed. (*Typically: be ~; get [into] ~; move [into] ~.) When my car is in highgear, it goes very fast. You can't start out in high gear. You must work up through the low ones.
2. Go to in full swing.
in high gear
also in full gear at the highest level of operation Preparations for the convention started weeks ago and are now in high gear.