The Collaborative International Dictionary of English v.0.48:

Spend \Spend\, v. i.
   1. To expend money or any other possession; to consume, use,
      waste, or part with, anything; as, he who gets easily
      spends freely.
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            He spends as a person who knows that he must come to
            a reckoning.                          --South.
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   2. To waste or wear away; to be consumed; to lose force or
      strength; to vanish; as, energy spends in the using of it.
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            The sound spendeth and is dissipated in the open
            air.                                  --Bacon.
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   3. To be diffused; to spread.
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            The vines that they use for wine are so often cut,
            that their sap spendeth into the grapes. --Bacon.
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   4. (Mining) To break ground; to continue working.
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The Collaborative International Dictionary of English v.0.48:

Spend \Spend\, v. t. [imp. & p. p. Spent; p. pr. & vb. n.
   Spending.] [AS. spendan (in comp.), fr. L. expendere or
   dispendere to weigh out, to expend, dispense. See Pendant,
   and cf. Dispend, Expend, Spence, Spencer.]
   1. To weigh or lay out; to dispose of; to part with; as, to
      spend money for clothing.
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            Spend thou that in the town.          --Shak.
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            Wherefore do ye spend money for that which is not
            bread?                                --Isa. lv. 2.
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   2. To bestow; to employ; -- often with on or upon.
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            I . . . am never loath
            To spend my judgment.                 --Herbert.
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   3. To consume; to waste; to squander; to exhaust; as, to
      spend an estate in gaming or other vices.
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   4. To pass, as time; to suffer to pass away; as, to spend a
      day idly; to spend winter abroad.
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            We spend our years as a tale that is told. --Ps. xc.
                                                  9.
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   5. To exhaust of force or strength; to waste; to wear away;
      as, the violence of the waves was spent.
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            Their bodies spent with long labor and thirst.
                                                  --Knolles.
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WordNet (r) 3.0 (2006):

spend
    v 1: pass time in a specific way; "how are you spending your
         summer vacation?" [syn: spend, pass]
    2: pay out; "spend money" [syn: spend, expend, drop]
    3: spend completely; "I spend my pocket money in two days"

Moby Thesaurus II by Grady Ward, 1.0:

110 Moby Thesaurus words for "spend":
   ablate, absorb, allot, assign, assimilate, attend to business,
   be exposed to, be subjected to, bestow, bleed white, blow, budget,
   burn up, busy, consecrate to, consume, contribute, cost, cost out,
   dedicate to, deplete, devote, digest, disburse, dish out,
   dissipate, drain, drain of resources, drop, eat, eat up, employ,
   encounter, endure, engage, erode, exhaust, expend, experience,
   feel, finish, finish off, fork out, fritter away, give,
   give over to, give to, go, go through, gobble, gobble up, hand out,
   have, impoverish, incur costs, ingest, invest, know, labor under,
   lavish, lay out, lose, meet, meet up with, meet with,
   mind the store, occupy, open the purse, outlay, pass,
   pass the time, pass through, pay, pay out, prodigal, profligate,
   put in, put out, run, run through, run up against, schedule,
   shell out, sink money in, spend the time, spender, spill, splurge,
   squander, squanderer, stand under, suck dry, suffer, sustain,
   swallow, swallow up, taste, throw away, throw money around,
   undergo, use up, waste, waste away, waster, wastethrift, wastrel,
   wear away, while, while away, wile