fix (v.) Look up fix at Dictionary.com
late 14c., "set (one's eyes or mind) on something," probably from Old French *fixer, from fixe "fixed," from Latin fixus "fixed, fast, immovable, established, settled," past participle of figere "to fix, fasten," from PIE root *dhigw- "to stick, to fix."

Sense of "fasten, attach" is c.1400; that of "settle, assign" is pre-1500 and evolved into "adjust, arrange" (1660s), then "repair" (1737). Sense of "tamper with" (a fight, a jury, etc.) is 1790. As euphemism for "castrate a pet" it dates from 1930. Related: Fixed; fixedly (1590s); fixing.
fix (n.) Look up fix at Dictionary.com
"position from which it is difficult to move," 1809, American English, from fix (v.). Meaning "dose of narcotic" is from 1934, shortened from fix-up (1867, originally in reference to liquor).