Etymology
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indulge (v.)
formerly also endulge, 1630s, "to grant as a favor;" 1650s, "to treat with unearned favor" (in reference both to persons and desires), a back-formation from indulgence (q.v.), or directly from Latin indulgere "be complaisant, be indulgent, yield; give oneself up to." Related: Indulged; indulging; indulgingly.
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overindulge (v.)

also over-indulge, "indulge to excess," 1690s, from over- + indulge. Related: Overindulged; overindulging.

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*dlegh- 
Proto-Indo-European root found in Celtic, Germanic, Slavic, and possibly Latin, meaning "to engage oneself, be or become fixed."

It forms all or part of: indulge; indulgence; play; pledge; plight (v.) "to pledge;" replevin.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit drmha-, drhya- "to fix, make firm;" Old Avestan derez- "fetter;" Gaulish delgu "to hold," Middle Welsh dala "to hold," Old Breton delgim "to hold;" Old Saxon plegan "vouch for," Gothic tulgjan "to fasten."
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luxuriate (v.)
1620s, "grow exuberantly or in abundance," also "indulge in luxury," from Latin luxuriatus, past participle of luxuriare "have to excess," figuratively "run riot, be dissolute, indulge to excess," from luxuria "excess, rankness, luxuriance" (see luxury). Related: Luxuriated; luxuriating.
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surfeit (v.)
late 14c., intransitive, "indulge or feed to excess," from surfeit (n.). Related: Surfeited; surfeiting. Transitive sense from 1590s.
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doll (v.)

1867, in dialect, "to pet, indulge" (a child), from doll (n.). Usually with up. Meaning "to dress (up)" is by 1906, American English. Related: Dolled; dolling.

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lecherous (adj.)

"prone to indulge in sensuality, lustful, lewd," c. 1300, probably from lecher + -ous; or else from rare Old French adjective lecheros. The nativized form is lickerish. Related: Lecherously; lecherousness.

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pander (v.)

"to indulge (another), to minister to base passions, cater for the lusts of others," c. 1600, from pander (n.). Meaning "to minister to others' prejudices for selfish ends" is from c. 1600. Related: Pandered; panderer; pandering.

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favor (v.)
mid-14c., "to regard with favor, indulge, treat with partiality," from Old French favorer, from favor "a favor, partiality" (see favor (n.)). Meaning "to resemble, look somewhat like" is from c. 1600. Related: Favored; favoring.
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hoyden (n.)
"ill-bred, boisterous young female," 1670s; earlier "rude, boorish fellow" (1590s), of uncertain origin; perhaps from Dutch heiden "rustic, uncivilized man," from Middle Dutch heiden "heathen," from Proto-Germanic *haithinaz- (see heathen). OED points to Elizabethan hoit "indulge in riotous and noisy mirth" in Nares.
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