in/into high gear

: rising or extending upward a great distance : taller than average, usual, or expected

: having a specified height or elevation : tall

: situated or passing above the normal level, surface, base of measurement, or elevation

: at or to a high place, altitude, level, or degree

: well, luxuriously

: an elevated place or region: such as

: hill, knoll

: the space overhead : sky

: clothing, garments

: movable property : goods

: equipment, paraphernalia

: to provide (machinery) with gearing (see gearing 2)

: to connect by gearing (see gearing 1)

: to make ready for effective operation