Definitions of nail:

• noun:   a thin pointed piece of metal that is hammered into materials as a fastener
• noun:   horny plate covering and protecting part of the dorsal surface of the digits
• noun:   a former unit of length for cloth equal to 1/16 of a yard
• verb:   attach something somewhere by means of nails

  Example: "Nail the board onto the wall"

• verb:   locate exactly

  Example: "The chemists could not nail the identity of the chromosome"

• verb:   succeed in obtaining a position

  Example: "He nailed down a spot at Harvard"

• verb:   complete a pass
• verb:   take into custody
• verb:   hit hard
• verb:   succeed at easily

  Example: "She nailed her astrophysics course"

• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #4772)