WordNet (r) 3.0 (2006):

keep going
    v 1: continue uninterrupted; "The disease will run on
         unchecked"; "The party kept going until 4 A.M." [syn: run
         on, keep going]
    2: suffice for a period between two points; "This money will
       keep us going for another year" [syn: tide over, bridge
       over, keep going]
    3: be a regular customer or client of; "We patronize this
       store"; "Our sponsor kept our art studio going for as long as
       he could" [syn: patronize, patronise, patronage,
       support, keep going]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "keep going":
   abide, bide, carry on, cease not, continue, drag on, endure,
   extend, go along, go on, hold, hold on, hold steady, jog on, keep,
   keep alive, keep at, keep at it, keep busy, keep driving,
   keep moving, keep on, keep trying, keep up, last, lengthen, linger,
   maintain, never cease, not accept compromise, peg away, perpetuate,
   persevere, persist, plug away, preserve, prolong, protract, remain,
   retain, run on, slog on, stagger on, stay, stay on, sustain,
   tarry