spike
noun
1.
2.
sports equipment consisting of a sharp point on the sole of a shoe worn by athletes
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)