What is Spike?

Spike definition and meaning on Dictionary terms:
a naillike fastener, 3 to 12 inches (7.6 to 30.5 cm) long and proportionately thicker than a common nail, for fastening together heavy timbers or railroad track.
something resembling such a nail; a stiff, sharp-pointed piece or part: to set spikes in the top of a cement wall.
a sharp-pointed piece of metal set with the point outward, as on a weapon.

an abrupt increase or rise: a chart showing a spike of unusual activity in the stock market; a sudden spike of electrical current.
a rectangular or naillike metal projection on the heel and sole of a shoe for improving traction, as of a baseball player or a runner.
spikes, a pair of shoes having such projections.
the unbranched antler of a young deer.
Botany. a flower stalk.
a pointed portion of a continuous curve or graph, usually rising above the adjacent portion: a spike in the value of the voltage.
Volleyball. a hard smash, hit close to the net, almost straight down into the opponent’s court.
Slang. a hypodermic needle.

verb (used with object), spiked, spik