The Collaborative International Dictionary of English v.0.48:

Gossip \Gos"sip\, n. [OE. gossib, godsib, a relation or sponsor
   in baptism, a relation by a religious obligation, AS.
   godsibb, fr. god + sib alliance, relation; akin to G. sippe,
   Goth. sibja, and also to Skr. sabh[=a] assembly.]
   [1913 Webster]
   1. A sponsor; a godfather or a godmother.
      [1913 Webster]

            Should a great lady that was invited to be a gossip,
            in her place send her kitchen maid, 't would be ill
            taken.                                --Selden.
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   2. A friend or comrade; a companion; a familiar and customary
      acquaintance. [Obs.]
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            My noble gossips, ye have been too prodigal. --Shak.
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   3. One who runs house to house, tattling and telling news; an
      idle tattler.
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            The common chat of gossips when they meet. --Dryden.
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   4. The tattle of a gossip; groundless rumor.
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            Bubbles o'er like a city with gossip, scandal, and
            spite.                                --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

Gossip \Gos"sip\, v. t.
   To stand sponsor to. [Obs.] --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gossip \Gos"sip\, v. i. [imp. & p. p. Gossiped; p. pr. & vb.
   n. Gossiping.]
   1. To make merry. [Obs.] --Shak.
      [1913 Webster]

   2. To prate; to chat; to talk much. --Shak.
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   3. To run about and tattle; to tell idle tales.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gossip
    n 1: light informal conversation for social occasions [syn:
         chitchat, chit-chat, chit chat, small talk, gab,
         gabfest, gossip, tittle-tattle, chin wag, chin-
         wag, chin wagging, chin-wagging, causerie]
    2: a report (often malicious) about the behavior of other
       people; "the divorce caused much gossip" [syn: gossip,
       comment, scuttlebutt]
    3: a person given to gossiping and divulging personal
       information about others [syn: gossip, gossiper,
       gossipmonger, rumormonger, rumourmonger, newsmonger]
    v 1: wag one's tongue; speak about others and reveal secrets or
         intimacies; "She won't dish the dirt" [syn: dish the
         dirt, gossip]
    2: talk socially without exchanging too much information; "the
       men were sitting in the cafe and shooting the breeze" [syn:
       chew the fat, shoot the breeze, chat, confabulate,
       confab, chitchat, chit-chat, chatter, chaffer,
       natter, gossip, jaw, claver, visit]

Moby Thesaurus II by Grady Ward, 1.0:

197 Moby Thesaurus words for "gossip":
   Paul Pry, Peeping Tom, a tale-bearing animal, account, ace, amigo,
   associate, babble, babblement, back-fence gossip, banter,
   bavardage, be closeted with, bedfellow, bedmate, bibble-babble,
   blab, blabber, blabbermouth, blah-blah, blather, blatherskite,
   blether, blethers, bosom buddy, bruit, buddy, bunkie, bunkmate,
   busybody, butty, buzz, cackle, camarade, caquet, caqueterie,
   chamberfellow, chat, chatter, chatterbox, chitchat,
   chitter-chatter, chronicle, chum, clack, classmate, clatter,
   colleague, comate, companion, company, compeer, comrade, confrere,
   consociate, consort, conversation, copartner, coze, crony, cry,
   dither, dope, eavesdropper, fellow, fellow student,
   flibbertigibbet, gab, gabble, gam, gas, gibber, gibble-gabble,
   girl friend, go on, gossip columnist, gossiper, gossiping,
   gossipmonger, gossipmongering, gossipry, grapevine,
   groundless rumor, guff, gup, gush, haver, hearsay, hint, hot air,
   idle talk, imply, information, inquirer, inquisitive, inquisitor,
   insinuate, intimate, jabber, jaw, make conversation, mate,
   mere talk, messmate, natter, newsmonger, newsmongering,
   newspaperman, nonsense talk, nosy Parker, old crony, on dit,
   on-dit, pal, palaver, pard, pardner, partner, patter,
   piece of gossip, playfellow, playmate, poop, pour forth, prate,
   prating, prattle, prittle-prattle, pry, querier, querist,
   questioner, quidnunc, ramble on, rattle, rattle on, reel off,
   reporter, retail gossip, roommate, rubberneck, rubbernecker,
   rumble, rumor, rumormonger, run on, scandal, scandalmonger,
   schoolfellow, schoolmate, scopophiliac, scuttlebutt, shipmate,
   side partner, sidekick, sieve, sightseer, small talk, snoop,
   snooper, spout, spout off, story, suggest, tabby, tale, talebearer,
   talebearing, taleteller, taletelling, talk, talk away,
   talk nonsense, talk on, talkee-talkee, tattle, tattler, tattletale,
   teammate, tell idle tales, telltale, tete-a-tete, tittle-tattle,
   tittle-tattler, twaddle, twattle, visit, voyeur, waffle, whisper,
   word, workfellow, yak, yakkety-yak, yenta, yokefellow, yokemate