Polish term (edited): [redukcja z] międzygazem

Międzygaz polega na odpowiednim uchyleniu przepustnicy ("dodaniu gazu") podczas zmiany biegu, w momencie gdy skrzynia znajduje się "na luzie", przy jednoczesnym chwilowym zwolnieniu sprzęgła, w celu wyrównania prędkości obrotowej koła zębatego włączanego biegu na wałku pośrednim z kołem zębatym tego biegu na wałku zdawczym, by w konsekwencji umożliwić "wrzucenie biegu". http://pl.wikipedia.org/wiki/Międzygaz

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Blipping
Blipping is the act of momentarily opening the throttle just after you pull in the clutch lever, so that once you’ve gone down a gear and released the clutch lever the engine rpm won’t have dropped off.

Slipping
In terms of the procedure, slipping the clutch during downshifts is a bit simpler, but it still takes some concentration and a deft touch to get right. This is actually a technique I was taught instead of blipping and the technique I now use today (without a slipper clutch).

http://biketrackdayshub.com/motorcycle-downshifting-techniqu...

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Heel-and-toe shifting is a driving technique used mostly in performance driving,[2] although some drivers use it on the road in everyday conditions in the interest of effectiveness. It involves operating the throttle and brake pedals simultaneously with the right foot, while facilitating normal activation of the clutch with the left foot. It is used when braking and downshifting simultaneously (prior to entering a turn), and allows the driver to "blip" the throttle to raise the engine speed and smoothly engage the lower gear. - http://en.wikipedia.org/wiki/Heel-and-toe