oblige
v.
c.1300, "to bind by oath," 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 bind" (see ligament). Main modern meaning "to make (someone) indebted by conferring a benefit or kindness" is from 1560s. Related: obliged; obliging.
〔李〕[ob-=toward 向；lig=to bind 束缚；-e⇒“to bind sb. toward sth. 将某人束缚在某物上”→] v. bind by a promise，contract or duty；compel 以誓言、契约、责任等束缚；迫使
〔李〕[ob-;lig;-e] v.束缚； 迫使； 施恩惠于 ←lig (L ligare)=to bind 束