What is the meaning of anchor?

noun

• A mechanical device that prevents a vessel from moving.
  • synonyms: ground tackle
• A central cohesive source of support and stability.
  • usage: "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
  • synonyms: mainstay, keystone, backbone, linchpin, lynchpin
• A television reporter who coordinates a broadcast to which several correspondents contribute.
  • synonyms: anchorman, anchorperson

verb

• Fix firmly and stably.
  • usage: "anchor the lamppost in concrete"
  • synonyms: ground
• Secure a vessel with an anchor.
  • usage: "We anchored at Baltimore"
  • synonyms: cast anchor, drop anchor