Etymology
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pike (n.4)

"highway," 1812 shortening of turnpike.

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pike (n.1)

"weapon with a long shaft and a pointed metal head," 1510s, from French pique "a spear; pikeman," from piquer "to pick, puncture, pierce," from Old French pic "sharp point or spike," a general continental term (Spanish pica, Italian picca, Provençal piqua), perhaps ultimately from a Germanic [Barnhart] or Celtic source (see pike (n.2)). An alternative explanation traces the Old French word (via Vulgar Latin *piccare "to prick, pierce") to Latin picus "woodpecker." No doubt, too, there is influence from pike (n.1), which by 1200 had a sense of "spiked staff."

"Formerly the chief weapon of a large part of the infantry; in the 18th c. superseded by the bayonet" [OED]; hence old expressions such as pass through pikes "come through difficulties, run the gauntlet;" push of pikes "close-quarters combat." German Pike, Dutch piek, Danish pik, etc. are from French pique.

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pike (n.3)

"type of long, slender, voracious freshwater fish," early 14c., pik (mid-12c. in place names), probably short for pike-fish, a special use of pike (n.2) in reference to the fish's long, pointed jaw, and in part from French brochet "pike" (fish), from broche "a roasting spit." In Middle English, proverbial for health and vigor.

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pike (n.2)

early 13c., pik, pyk, "pointed tip or spike on a staff, pole, weapon, etc.," collateral (long-vowel) form of pic (source of pick (n.1)), from Old English piic "pointed object, pickaxe," which is perhaps from a Celtic source (compare Gaelic pic "pickaxe," Irish pice "pike, pitchfork"). The word probably has been influenced by, or is partly from, Old French pic "sharp point or spike," itself perhaps from Germanic (see pike (n.1)), Old Norse pic, and Middle Dutch picke, pecke. Pike, pick (n.1), and pitch (n.1) formerly were used indifferently in English.

From c. 1400 as "a sharp, pointed mountain or summit." The pike position in diving, gymnastics, etc., is attested by 1928, perhaps on the notion of "tapering to a point."

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pikeman (n.)

"soldier armed with a pike," by 1560s, from pike (n.1) + man (n.).

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pikestaff (n.)

"staff with an iron head more or less pointed," mid-14c., from pike (n.2) + staff (n.).

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pick (n.1)

c. 1200, "pointed iron tool for breaking up rock or ground," apparently a variant of pike (n.4).

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pickerel (n.)

late 13c., pikerel, "young pike," from pike (n.3), the fish, with French pejorative suffix -rel; perhaps formed in Anglo-French. In the Eastern U.S., applied to a common type of pike regardless of age.

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Picard 

c. 1300 (late 12c. as a surname), "resident or inhabitant of Picardy," the region in northeastern France, from Old French pic (Modern French pique) "pike" (see pike (n.1)); the characteristic weapon of the people who lived in this part of northern France in ancient times.

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pique (v.)

"to nettle, irritate, offend; stimulate to action by arousing envy, jealousy, etc., in a slight degree," 1670s, from French piquer "to prick, sting" (see pike (n.1)). Softened meaning "to stimulate, excite" is from 1690s. Related: Piqued; piquing.

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