The Collaborative International Dictionary of English v.0.48:

Inrush \In"rush`\, n.
   A rush inwards; as, the inrush of the tide. --G. Eliot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Inrush \In*rush"\, v. i.
   To rush in. [Obs.] --Holland.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inrush
    n 1: an inflow; "an inpouring of spiritual comfort" [syn:
         inpouring, inpour, inrush]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "inrush":
   affluence, afflux, affluxion, air current, crosscurrent, current,
   current of air, downdraft, draft, fall wind, flow in, flow of air,
   following wind, head wind, indraft, indrawing, inflood, inflooding,
   inflow, influx, influxion, inhalation, inpour, inpouring, inrun,
   inspiration, jetstream, katabatic wind, monsoon, movement of air,
   pour in, stream, stream of air, tail wind, undercurrent, updraft,
   wind