1. jackshaft - Noun
2. jackshaft - Verb
A common mechanical component used to transfer or synchronize rotational force in a machine.
Synonym: countershaft
A wheelless axle used to turn the wheels of a locomotive.
jackshaft (third-person singular simple present jackshafts, present participle jackshafting, simple past and past participle jackshafted)
To transfer or synchronize rotational force by means of a jackshaft.
Synonym: countershaft