Etymology
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spike (n.1)

"large nail," mid-14c., perhaps from or related to a Scandinavian word, such as Old Norse spik "splinter," Middle Swedish spijk "nail," from Proto-Germanic *spikaz (source also of Middle Dutch spicher, Dutch spijker "nail," Old English spicing "large nail," Old English spaca, Old High German speihha "spoke"), from PIE root *spei- "sharp point" (source also of Latin spica "ear of corn," spina "thorn, prickle, backbone," and perhaps pinna "pin" (see pin (n.)); Greek spilas "rock, cliff;" Lettish spile "wooden fork;" Lithuanian speigliai "thorns," spitna "tongue of a buckle," Old English spitu "spit").

The English word also might be influenced by and partly a borrowing of Latin spica (see spike (n.2)), from the same root. Slang meaning "needle" is from 1923. Meaning "pointed stud in athletic shoes" is from 1832. Electrical sense of "pulse of short duration" is from 1935.

spike (n.2)

"ear of grain," c. 1300, from Latin spica "ear of grain," from PIE *spei-ko-, from suffixed form of root *spei- "sharp point" (see spine).

spike (v.)

1620s, "to fasten with spikes," from spike (n.1). Meaning "to rise in a spike" is from 1958. Military sense (1680s) means "to disable guns by driving a large nail into the touch-hole." Figurative use of this sense is from 1823. Meaning "to lace (a drink) with liquor" is from 1889. Journalism sense of "to kill a story before publication" (1908) is from the metal spindle in which old-time editors filed hard copy of stories after they were set in type, or especially when rejected for publication. Related: Spiked; spiking.

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Definitions of spike
1
spike (n.)
a transient variation in voltage or current;
spike (n.)
sports equipment consisting of a sharp point on the sole of a shoe worn by athletes;
spikes provide greater traction
spike (n.)
fruiting spike of a cereal plant especially corn;
Synonyms: ear / capitulum
spike (n.)
(botany) an indeterminate inflorescence bearing sessile flowers on an unbranched axis;
spike (n.)
a sharp rise followed by a sharp decline;
the seismograph showed a sharp spike in response to the temblor
spike (n.)
a very high narrow heel on women's shoes;
Synonyms: spike heel / stiletto heel
spike (n.)
each of the sharp points on the soles of athletic shoes to prevent slipping (or the shoes themselves);
the second baseman sharpened his spikes before every game
golfers' spikes damage the putting greens
spike (n.)
a sharp-pointed projection along the top of a fence or wall (or a dinosaur);
spike (n.)
a long, thin sharp-pointed implement (wood or metal);
one of the spikes impaled him
spike (n.)
any holding device consisting of a rigid, sharp-pointed object;
the spike pierced the receipts and held them in order
Synonyms: spindle
spike (n.)
a large stout nail;
they used spikes to fasten the rails to a railroad tie
2
spike (v.)
stand in the way of;
spike (v.)
pierce with a sharp stake or point;
Synonyms: transfix / impale / empale
spike (v.)
secure with spikes;
spike (v.)
bring forth a spike or spikes;
Synonyms: spike out
spike (v.)
add alcohol to (beverages);
the punch is spiked!
Synonyms: lace / fortify
spike (v.)
manifest a sharp increase;
the voltage spiked
From wordnet.princeton.edu