1. [n]  mature male of various mammals (especially deer or antelope)
2. [n]  a framework for holding wood that is being sawed
3. [n]  a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting
4. [n]  United States author whose novels drew on her experiences as a missionary in China (1892-1973)
5. [n]  (United States) a piece of paper money worth one dollar
6. [adj]  of the lowest rank in a category; "a buck private"
7. [v]  jump vertically, with legs stiff and back arched, as of horses
8. [v]  move quickly and violently; "The car tore down the street"; "He came charging into my office"
9. [v]  resist; "buck the trend"
10. [v]  to strive with determination; "John is bucking for a promotion."

Buck
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1. \Buck\ (b[u^]k), n. [Akin to LG. b["u]ke, Dan. byg, Sw.
   byk, G. bauche: cf. It. bucato, Prov. Sp. bugada, F.
   bu['e]e.]
   1. Lye or suds in which cloth is soaked in the operation of
      bleaching, or in which clothes are washed.
   2. The cloth or clothes soaked or washed. [Obs.] --Shak.
   

2. \Buck\, v. t. [imp. & p. p. {Bucked} (b[u^]kt); p. pr. &
   vb. n. {Bucking}.] [OE. bouken; akin to LG. b["u]ken, Dan.
   byge, Sw. byka, G. bauchen, beuchen; cf. OF. buer. Cf. the
   preceding noun.]
   1. To soak, steep, or boil, in lye or suds; -- a process in
      bleaching.
   2. To wash (clothes) in lye or suds, or, in later usage, by
      beating them on stones in running water.
   3. (Mining) To break up or pulverize, as ores.
   

3. \Buck\, n. [OE. buk, bucke, AS. bucca, bua, he-goat; akin
   to D. bok, OHG. pocch, G. bock, Ir. boc, W. bwch, Corn. byk;
   cf. Zend b?za, Skr. bukka. [root]256. Cf. {Butcher}, n.]
   1. The male of deer, especially fallow deer and antelopes, or
      of goats, sheep, hares, and rabbits.
   Note: A male fallow deer is called a fawn in his first year;
         a pricket in his second; a sorel in his third; a sore
         in his fourth; a buck of the first head in his fifth;
         and a great buck in his sixth. The female of the fallow
         deer is termed a doe. The male of the red deer is
         termed a stag or hart and not a buck, and the female is
         called a hind. --Brande & C.
   2. A gay, dashing young fellow; a fop; a dandy.
            The leading bucks of the day.         --Thackeray.
   3. A male Indian or negro. [Colloq. U.S.]
   Note: The word buck is much used in composition for the names
         of antelopes; as, bush buck, spring buck.
   {Blue buck}. See under {Blue}.
   {Water buck}, a South African variety of antelope ({Kobus
      ellipsiprymnus}). See Illust. of {Antelope}.
   

4. \Buck\ (b[u^]k), v. i.
   1. To copulate, as bucks and does.
   2. To spring with quick plunging leaps, descending with the
      fore legs rigid and the head held as low down as possible;
      -- said of a vicious horse or mule.
   

5. \Buck\, v. t.
   1. (Mil.) To subject to a mode of punishment which consists
      in tying the wrists together, passing the arms over the
      bent knees, and putting a stick across the arms and in the
      angle formed by the knees.
   2. To throw by bucking. See {Buck}, v. i., 2.
            The brute that he was riding had nearly bucked him
            out of the saddle.                    --W. E.
                                                  Norris.
   

6. \Buck\, n.
   A frame on which firewood is sawed; a sawhorse; a sawbuck.
   {Buck saw}, a saw set in a frame and used for sawing wood on
      a sawhorse.
   

7. \Buck\, n. [See {Beech}, n.]
   The beech tree. [Scot.]
   {Buck mast}, the mast or fruit of the beech tree. --Johnson.