Definitions of furrow:

• noun:   a long shallow trench in the ground (especially one made by a plow)
• noun:   a slight depression in the smoothness of a surface
• verb:   hollow out in the form of a furrow or groove

  Example: "Furrow soil"

• verb:   cut a furrow into a columns
• verb:   make wrinkled or creased

  Example: "Furrow one's brow"

• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #14324)