Definition of "oblige"

oblige

/əˈblaɪd͡ʒ/

verb
third-person singular simple present obliges, present participle obliging, simple past and past participle obliged
1. (transitive) To constrain someone by force or by social, moral or legal means.
  Quotations
  Tho' he was some time awake before me, yet did he not offer to disturb a repose he had given me so much occasion for; but on my first stirring, which was not till past ten o'clock, I was oblig'd to endure one more trial of his manhood.
  1749, [John Cleland], “(Please specify the letter or volume)”, in Memoirs of a Woman of Pleasure [Fanny Hill], London: […] G. Fenton [i.e., Fenton and Ralph Griffiths] […]
2. (transitive, intransitive) To do (someone) a service or favour (hence, originally, creating an obligation).
  Quotations
  In the mean time I have another trouble to give you, if you will oblige me in it; and that is to get me a sight of the famous Orrery, which I have heard you and others so often speak of; and which I think was made by Mr. Rowley, the famous Mathematical Instrument-Maker.
  1719, John Harris, Astronomical dialogues between a gentleman and a lady, page 151
3. (intransitive) To be indebted to someone.