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"high in stature," 1520s, probably ultimately from Old English getæl "prompt, active." Sense evolved to "brave, valiant, seemly, proper" (late 14c.), then to "attractive, handsome" (mid-15c.), and finally "being of more than average height." The Old English word is related to Old High German gi-zal "quick," Gothic un-tals "indocile."
Sense evolution is remarkable, but adjectives applied to persons often mutate quickly in meaning (e.g. pretty, buxom, German klein "small, little," which in Middle High German meant the same as its English cognate clean). Meaning "exaggerated" (as in tall tale) is American English colloquial attested by 1846. Phrase tall, dark, and handsome is recorded from 1906.
To talk forever, but with nobody listening: talk till you are blue in the face, but no one is changing their mind