To restore the appearance, powers, or feelings of youth to; make as if young again; renew; refresh.Of a stream, to increase its gradient, and with this, its velocity and erosive power, so that its effectiveness and apparent youth are renewed. This result is produced by the uplifting of a region which has been notably reduced by the erosion of the streams which continue to occupy it.Of a region, to again impress the characters of youthful topography upon (it) when it is well advanced in its erosion cycle. This effect is dependent upon rejuvenation of the streams.