early 15c., "to inspect and remove the dirt and dross from (spices)," from Anglo-French garbeler "to sift" (late 14c.) and directly from Medieval Latin, Catalan, and Italian garbellare, from Arabic gharbal "to sift," related to kirbal "sieve," which perhaps is from Late Latin cribellum, diminutive of Latin cribrum "sieve" (from PIE root *krei- "to sieve"). Apparently the word was widespread among Mediterranean traders (compare Italian garbellare, Spanish garbillare "to sift grain").
In later-medieval Europe, pepper and ginger and some other spices were always imports from the Arabic-speaking Eastern Mediterranean, and the same goes for many botanical drugs, and a few expensive colorants. The spices, drugs and colorants had variable amounts of natural chaff residuals and occasionally had unnatural added chaff. ["English Words of Arabic Ancestry"]
From late 15c. in a general sense of "sort out the finer parts" of anything, "removal of what is objectionable," then "distort for some devious purpose or to give false impression;" especially "mix up, confuse or distort language" (1680s). Related: Garbled; garbling. In Middle English garbeler (Anglo-French garbelour) meant "official who garbles spices and sometimes also other dry goods" (early 15c.); it is attested from 1690s as "one who mixes up or mutilates words or language."
Perhaps the English word originally is from a derivative of Old French garbe/jarbe "sheaf of wheat, bundle of sheaves," though the sense connection is difficult. This word is from Proto-Germanic *garba- (source also of Dutch garf, German garbe "sheaf"), from PIE *ghrebh- (1) "to seize, reach" (see grab (v.)).
"In modern American usage garbage is generally restricted to mean kitchen and vegetable wastes" [Craigie]. Used figuratively for "worthless, offensive stuff" from 1590s. Garbage can is from 1901. Garbage collector "trash man" is from 1872; Australian shortening garbo attested from 1953. Garbology "study of waste as a social science" is by 1976; garbologist is from 1965.
"to mutilate, to hack or cut by random, repeated blows," c. 1400, from Anglo-French mangler, frequentative of Old French mangoner "cut to pieces," a word of uncertain origin, perhaps connected with Old French mahaignier "to maim, mutilate, wound" (see maim). The figurative meaning "to destroy the symmetry or completeness of" is from early 15c.; as "to mispronounce (words), garble," from 1530s. Related: Mangled; mangler; mangling.
"one who treats diseases or malformations of the hands or feet," 1785, from chiro- "hand" + pod-, stem of Greek pous "foot" (from PIE root *ped- "foot") + -ist. Probably coined by Canadian-born U.S. healer Daniel Palmer (1845-1913); originally they treated both hands and feet. A much-maligned word among classicists, who point out it could mean "having chapped feet" but probably doesn't, and in that case it is an etymological garble and no one can say for sure what it is meant to signify. Related: Chiropody.