unsteadying

verb

1. (form-of, gerund, participle, present)present participle and gerund of unsteady

   “A correspondent suggested that the superior riding qualities of the latter were due to the absence of piston-valve chests above the cylinders, which made it possible to bring the underside of the water-tanks to a lower level than that of the "Rivers", so minimising the unsteadying effect of water surging in the tanks.”