Definition 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: complete a pass
verb: take into custody
verb: attach something somewhere by means of nails
"Nail the board onto the wall."
verb: hit hard
verb: locate exactly
"The chemists could not nail the identity of the chromosome."
verb: succeed at easily
"She nailed her astrophysics course."
verb: succeed in obtaining a position
"He nailed down a spot at Harvard."