Etymology
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oblige (v.)

c. 1300, obligen, "to bind by oath, put under moral or legal obligation, devote," from Old French obligier "engage one's faith, commit (oneself), pledge" (13c.), from Latin obligare "to bind, bind up, bandage," figuratively "put under obligation," from ob "to" (see ob-) + ligare "to bind," from PIE root *leig- "to tie, bind." Main modern meaning "to make (someone) indebted by conferring a benefit or kindness" is from 1560s.

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Definitions of oblige

oblige (v.)
force somebody to do something;
Synonyms: compel / obligate
oblige (v.)
bind by an obligation; cause to be indebted;
Synonyms: bind / hold / obligate
oblige (v.)
provide a service or favor for someone;
We had to oblige him
Synonyms: accommodate
From wordnet.princeton.edu