Jog, n.
 1. A slight shake; a shake or push intended to give notice or awaken attention; a push; a jolt.
    To give them by turns an invisible jog.   --Swift.
 2. A rub; a slight stop; an obstruction; hence, an irregularity in motion of from; a hitch; a break in the direction of a line or the surface of a plane.
 Jog trot, a slow, regular, jolting gait; hence, a routine habit or method, persistently adhered to.

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 jog trot
      n : an easy gait of a horse; midway between a walk and a trot