The Collaborative International Dictionary of English v.0.48:

Surge \Surge\, v. t. [imp. & p. p. Surged; p. pr. & vb. n.
   Surging.] [Cf. F. surgir to cast anchor, to land. Cf.
   Surge, n.] (Naut.)
   To let go or slacken suddenly, as a rope; as, to surge a
   hawser or messenger; also, to slacken the rope about (a
   capstan).
   [1913 Webster]

WordNet (r) 3.0 (2006):

surging
    adj 1: characterized by great swelling waves or surges; "billowy
           storm clouds"; "the restless billowing sea"; "surging
           waves" [syn: billowy, billowing(a), surging]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "surging":
   affluent, confluent, coursing, decurrent, defluent, diffluent,
   flowing, fluent, fluxional, fluxive, gulfy, gushing, mazy,
   meandering, pouring, profluent, racing, running, rushing,
   serpentine, sluggish, streaming, surgy, tidal, vortical