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."