Definitions of anchor:

• noun:   a mechanical device that prevents a vessel from moving
• noun:   a central cohesive source of support and stability

  Example: "Faith is his anchor"

• noun:   a television reporter who coordinates a broadcast to which several correspondents contribute
• verb:   secure a vessel with an anchor

  Example: "We anchored at Baltimore"

• verb:   fix firmly and stably

  Example: "Anchor the lamppost in concrete"