3. Something resembling a nail in shape, sharpness, or use.
4. A measure of length formerly used for cloth, equal to 1/16 yard (5.7 cm).
nailed, nailing, nails
5. Slang. a. To strike or bring down, especially with something shot or hurled: nail a bird in flight. b. To gain thorough understanding of; master: a brilliant student who nailed all her courses in thermodynamics.
6. Baseball. To put out (a base runner).
[Middle English, from Old English