Definition of "uprush"

The present moment had certainly inflicted on fantasy the presentment of Podson in a posture of devotion, squeezing her hand, and even the frustrations of an alarmed spinster could not defeat the up-rush of bright exciting imageries inspired by that action.

1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 187

It now appears that the locomotive did not blow up, as was commonly stated at the time, but that the aeroplane flew so low as to come into contact with the dome of the engine, knocking it off. It was the combination of the impact and the uprush of steam that so disturbed the equilibrium of the raider as to cause it to crash.

1943 May and June, “Notes and News: Effective Locomotive "Ack-Ack" Fire”, in Railway Magazine, page 180