deliveryoudaoicibaDictYouDict[deliver 词源字典]
deliver: [13] To deliver something is etymologically to ‘set it free’. The word comes via Old French delivrer from late Latin dēlīberāre, a compound verb formed from the intensive prefix dē- and Latin līberāre ‘set free’, a derivative of the adjective līber ‘free’. Its meaning developed through ‘set free’ to ‘give up, surrender’ and finally ‘hand over to someone else’. (Classical Latin dēlīberāre, source of English deliberate [15], is an entirely different verb, derived from Latin lībra ‘scales’.)
=> liberate[deliver etymology, deliver origin, 英语词源]
deliver (v.)youdaoicibaDictYouDict
c. 1200, "save, rescue, set free, liberate," from Old French delivrer "to set free; remove; save, preserve; hand over (goods)," also used of childbirth, from Late Latin deliberare, from de- "away" (see de-) + Latin liberare "to free" (see liberal (adj.)).

Childbirth sense in English, "to bring (a woman) to childbirth," is from c. 1300. Sense of "hand over, give, give up, yield" is c. 1300. in English, which brings it in opposition to its root. Meaning "project, throw" is 1590s. Related: Delivered; delivering.