Verb

(oblig)

To constrain someone by force or by social, moral or legal means.

I am obliged to report to the police station every week.

{{quote-Fanny Hill, part=3 , 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.}}

To do someone a service or favour (hence, originally, creating an obligation).

He obliged me by not parking his car in the drive.

*

To be indebted to someone.

I am obliged to you for your recent help.

To do a service or favour.

The singer obliged with another song.

Verb

(en verb)

To do as ordered by (a person, institution etc), to act according to the bidding of.

To do as one is told.

(obsolete) To be obedient, compliant (to a given law, restriction etc.).

* 1590 , Edmund Spenser, The Faerie Queene , III.iv:

They were all taught by Triton, to obay / To the long raynes, at her commaundement [...].