Etymology
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spot (v.)
mid-13c., "to mark or stain with spots;" late 14c. as "to stain, sully, tarnish," from spot (n.). Meaning "to see and recognize," is from 1718, originally colloquial and applied to a criminal or suspected person; the general sense is from 1860. Related: Spotted; spotting. Spotted dick "suet pudding with currants and raisins" is attested from 1849.
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spot (n.)

c. 1200, "moral stain," probably from Old English splott "a spot, blot, patch (of land)," and partly from or related to Middle Dutch spotte "spot, speck." Other cognates are East Frisian spot "speck," North Frisian spot "speck, piece of ground," Old Norse spotti "small piece," Norwegian spot "spot, small piece of land." It is likely that some of these are borrowed from others, but the exact evolution now is impossible to trace.

Meaning "speck, stain" is from mid-14c. The sense of "particular place, small extent of space" is from c. 1300. Meaning "short interval in a broadcast for an advertisement or announcement" is from 1923. Preceded by a number (as in five-spot) it originally was a term for "prison sentence" of that many years (1901, American English slang). To put (someone) on the spot "place in a difficult situation" is from 1928. Colloquial phrase hit the spot "satisfy, be what is required" is from 1868. Spot check is attested by 1933. Adverbial phrase spot on "completely right" attested from 1920.

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blind spot (n.)
1864, "spot within one's range of vision but where one cannot see," from blind (adj.) + spot (n.). Of the point on the retina insensitive to light (where the optic nerve enters the eye), from 1872. Figurative sense (of moral, intellectual, etc. sight) by 1907.
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g spot (n.)
also g-spot, 1981, short for Gräfenberg spot, named for German gynecologist Ernst Gräfenberg (1881-1957), who described it in 1950.
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hot spot (n.)
also hotspot, 1888 as a skin irritation; 1931 as "nightclub;" 1938 in the firefighting sense; 1941 as "place of international conflict." See hot (adj.) + spot (n.).
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weld (n.2)
"joint formed by welding," 1831, from weld (v.).
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nightspot (n.)
also night spot, "nightclub," 1936, from night (n.) + spot (n.) "place."
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sunspot (n.)
also sun-spot, 1849, in astronomy, from sun (n.) + spot (n.). Earlier "a spot on the skin caused by exposure to the sun" (1818).
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splotch (n.)
c. 1600, "a broad, ill-defined spot," perhaps a blend of spot, blot, and/or botch. Old English had splott "spot, blot; patch of land." Related: Splotchy; splotchiness.
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weld (v.)
1590s, "unite or consolidate by hammering or compression, often after softening by heating," alteration of well (v.) "to boil, rise;" influenced by past participle form welled. Related: Welded; welding.
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