1. a naillike fastener, 3 to 12 inches (7.6 to 30.5 centimeters) long and proportionately thicker than a common nail, for fastening together heavy timbers or railroad track.
2. something resembling such a nail; a stiff, sharp-pointed piece or part: to set spikes in the top of a cement wall.
3. a sharp-pointed piece of metal set with the point outward, as on a weapon.
4. an abrupt increase or rise: a chart showing a spike of unusual activity in the stock market; a sudden spike of electrical current.
5. 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.
6. a pair of shoes having such projections.
7. the unbranched antler of a young deer.
8. a flower stalk.
9. a pointed portion of a continuous curve or graph, usually rising above the adjacent portion: a spike in the value of the voltage.
10. a hard smash, hit close to the net, almost straight down into the opponent's court.
11. a hypodermic needle.

12. to fasten or secure with a spike or spikes.
13. to provide or set with a spike or spikes.
14. to pierce with or impale on a spike.
15. to set or stud with something suggesting spikes.
16. to injure (another player or a competitor) with the spikes of one's shoe, as in baseball.
17. to hit (a ball in the air) with a powerful, overarm motion from a position close to the net so as to cause it to travel almost straight down into the court of the opponents.
18. to slam (the ball) to the ground in the end zone, after scoring a touchdown.
19. to render (a muzzle-loading gun) useless by driving a spike into the touchhole.
20. to make ineffective; frustrate or thwart: to spike a rumor; to spike someone's chances for promotion.
21. Informal.
• to add alcoholic liquor to (a drink).
• to add (a chemical, poison, or other substance) to: The cocoa was spiked with cyanide.
22. to refuse (a story) by or as if by placing on a spindle.

23. to rise or increase sharply (often followed by up): Interest rates spiked up last week.

24. gun¹ (def. 16).

1. an ear, as of wheat or other grain.
2. an inflorescence in which the flowers are without a stalk, or apparently so, along an elongated, unbranched axis.

1. a sharp point
2. any sharp-pointed object, esp one made of metal
3. a long metal nail
4. physics
• a transient variation in voltage or current in an electric circuit
• a graphical recording of this, such as one of the peaks on an electroencephalogram
5. shoes with metal projections on the sole and heel for greater traction, as used by athletes
6. the straight unbranched antler of a young deer
7. British slang another word for dosshouse

8. to secure or supply with or as with spikes
9. to render ineffective or block the intentions of; thwart
10. to impale on a spike
11. to add alcohol to (a drink)
12. to reject (a news story)
13. to hit (a ball) sharply downwards with an overarm motion from the front of one's own court into the opposing court
14. (formerly) to render (a cannon) ineffective by blocking its vent with a spike
15. to thwart someone's purpose

1. an inflorescence consisting of a raceme of sessile flowers, as in the gladiolus and sedges
2. an ear of wheat, barley, or any other grass that has sessile spikelets

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