Etymology
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low-down (adj.)

also low down, lowdown, "vulgar, far down the social scale," 1888, from low (adj.) + down (adv.). Earlier it had meant "humble" (1540s). As a noun, 1915, from the adjective, American English. Low-downer was late 19c. American English colloquial for "poor white; rude, mean person."

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Definitions of low-down
1
low-down (adj.)
(of jazz) having the soulful feeling of early blues;
Synonyms: funky
low-down (adj.)
of the most contemptible kind;
a low-down sneak
Synonyms: abject / low / miserable / scummy / scurvy
2
low-down (n.)
slang terms for inside information;
Synonyms: dope / poop / the skinny
From wordnet.princeton.edu