Etymology
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shyster (n.)

"unscrupulous lawyer," 1843, U.S. slang, probably altered from German Scheisser "incompetent worthless person," from Scheisse "shit" (n.), from Old High German skizzan "to defecate" (see shit (v.)).

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Definitions of shyster

shyster (n.)
a person (especially a lawyer or politician) who uses unscrupulous or unethical methods;
Synonyms: pettifogger
From wordnet.princeton.edu