What is the meaning of Buck?

noun

• A gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting.
  • synonyms: vaulting horse, long horse
• A piece of paper money worth one dollar.
  • synonyms: dollar, dollar bill, one dollar bill, clam
• United States author whose novels drew on her experiences as a missionary in China (1892-1973.
  • synonyms: Pearl Buck, Pearl Sydenstricker Buck
• A framework for holding wood that is being sawed.
  • synonyms: sawhorse, horse, sawbuck
• Mature male of various mammals (especially deer or antelope. )

verb

• To strive with determination.
  • usage: "John is bucking for a promotion"
• Resist.
  • usage: "buck the trend"
  • synonyms: go against
• Move quickly and violently.
  • usage: "The car tore down the street"; "He came charging into my office"
  • synonyms: tear, shoot, shoot down, charge
• Jump vertically, with legs stiff and back arched.
  • usage: "the yung filly bucked"
  • synonyms: jerk, hitch