countershaft

== English == === Etymology === From counter- +‎ shaft. === Noun === countershaft (plural countershafts) Synonym of jackshaft (“a mechanical component for rotational force”). ==== Alternative forms ==== counter shaft === Verb === countershaft (third-person singular simple present countershafts, present participle countershafting, simple past and past participle countershafted) Synonym of jackshaft.