Etymology
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perspicacious (adj.)

"sharp-sighted," also "of acute mental discernment," 1630s, formed as an adjective to perspicacity, from Latin perspicax "sharp-sighted, having the power of seeing through; acute," from perspicere "look through, look closely at," from per "through" (from PIE root *per- (1) "forward," hence "through") + specere "look at" (from PIE root *spek- "to observe"). Related: Perspicaciously; perspicaciousness.

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sandpaper (n.)

also sand-paper, "stout paper with a fixed layer of sharp sand," 1788, from sand (n.) + paper (n.).

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plink (v.)

"emit a short, sharp metallic sound," 1941, imitative. As a noun by 1971. Related: Plinked; plinking.

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pig-sticker (n.)

also pigsticker, "sharp knife, bayonet," by 1890, from pig (n.1) + agent noun from stick (v.).

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clink (n.1)
"sharp, ringing sound made by collision of sonorous (especially metallic) bodies," c. 1400, from clink (v.).
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edged (adj.)
1590s, "having a sharp edge;" 1690s, "having a hem or border," past-participle adjective from edge (v.).
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snippy (adj.)
1727, "parsimonious;" 1848, "fault-finding, sharp;" 1886, "fragmentary;" from snip (n.) + -y (2). Related: Snippily; snippiness.
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chink (n.3)

"sharp, clear, metallic sound" (especially of coin), 1580s, probably imitative. As a verb from 1580s. Related: Chinked; chinking.

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knap (v.)
"to strike with a sharp sound," late 15c., echoic. Earlier (c. 1400) as a noun meaning "abrupt stroke." Especially "to chip or break by a sharp blow" (1530s), the sense shifting from the sound to the act that makes it. Especially of the method of sharpening flints from 1862. Related: Knapped; knapper; knapping. For pronunciation, see kn-.
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chiseled (adj.)

"having sharp outlines" (as though worked with a chisel), 1821, figurative past-participle adjective from chisel (v.).

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