Definitions of falling:

• adjective:   suddenly losing an upright position

  Example: "They ran from the falling tree"

• adjective:   becoming lower or less in degree or value

  Example: "A falling market"

• adjective:   decreasing in amount or degree

  Example: "Falling temperature"

• adjective:   coming down freely under the influence of gravity

  Example: "Falling rain"

• name:  A surname (very rare: popularity rank in the U.S.: #38061)