1
general::
Phrase(s): *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 high gear, 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.
McGrawhill's American Idioms And Phrasal Verbs