Webster's Revised Unabridged Dictionary · 1913

Indulge

Indulge , transitive verb

[Latin indulgere to be kind or tender to one; compare OIr. dilgud, equiv. to Latin remissio, OIr. dligeth, equiv. to Latin lex, Gothic dulgs debt.]

1.
To be complacent toward; to give way to; not to oppose or restrain
(a)
to give free course to; to give one's self up to; as, to indulge sloth, pride, selfishness, or inclinations;
(b)
to yield to the desire of; to gratify by compliance; to humor; to withhold restraint from; as, to indulge children in their caprices or willfulness; to indulge one's self with a rest or in pleasure.
Hope in another life implies that we indulge ourselves in the gratifications of this very sparingly. — Atterbury
2.
To grant as by favor; to bestow in concession, or in compliance with a wish or request.
Persuading us that something must be indulged to public manners. — Jer. Taylor
Yet, yet a moment, one dim ray of light Indulge, dread Chaos, and eternal Night! — Pope

It is remarked by Johnson, that if the matter of indulgence is a single thing, it has with before it; if it is a habit, it has in; as, he indulged himself with a glass of wine or a new book; he indulges himself in idleness or intemperance. See Gratify.

Indulge , intransitive verb

To indulge one's self; to gratify one's tastes or desires; esp., to give one's self up (to); to practice a forbidden or questionable act without restraint; -- followed by in, but formerly, also, by to.
Willing to indulge in easy vices. — Johnson