Noun

1. A transient variation in voltage or current
2. Sports equipment consisting of a sharp point on the sole of a shoe worn by athletes
3. Fruiting spike of a cereal plant especially corn
4. (botany) an indeterminate inflorescence bearing sessile flowers on an unbranched axis
5. A sharp rise followed by a sharp decline
6. A very high narrow heel on women's shoes
7. Each of the sharp points on the soles of athletic shoes to prevent slipping (or the shoes themselves)
8. A sharp-pointed projection along the top of a fence or wall (or a dinosaur)
9. A long, thin sharp-pointed implement (wood or metal)
10. Any holding device consisting of a rigid, sharp-pointed object
11. A large stout nail

Verb

1. Stand in the way of
2. Pierce with a sharp stake or point
3. Secure with spikes
4. Bring forth a spike or spikes
5. Add alcohol to (beverages)
6. Manifest a sharp increase