What is the meaning of opposing?

verb

• Be against; express opposition to.
  • usage: "We oppose the ban on abortion"
  • synonyms: oppose
• Fight against or resist strongly.
  • usage: "The senator said he would oppose the bill"; "Don't fight it"
  • synonyms: fight, oppose, fight back, fight down, defend
• Contrast with equal weight or force.
  • synonyms: oppose, counterbalance
• Set into opposition or rivalry.
  • usage: "let them match their best athletes against ours"; "pit a chess player against the Russian champion"; "He plays his two children off against each other"
  • synonyms: pit, oppose, match, play off
• Act against or in opposition to.
  • usage: "She reacts negatively to everything I say"
  • synonyms: react, oppose
• Be resistant to.
  • usage: "The board opposed his motion"
  • synonyms: oppose, controvert, contradict

adjective

• Characterized by active hostility.
  • usage: "opponent (or opposing) armies"
  • synonyms: opponent