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    un-

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    un-
    un- /ʌn/ prefix
     Sense 1
     Language: Old English
     Sense 2
     Language: Old English
     Origin: un-, on-, from and- 'against'
    1. [in adjectives, adverbs, and nouns] used to show a negative, a lack, or an opposite
       SYN  not:
        unfair
        unhappy
        unfortunately
        uncertainty
    2. [in verbs] used to show an opposite of a particular action:
        to undress (=to take your clothes off)
        Have you unpacked yet (=taken your things out of your suitcase)?
        I heard Lila unlock the front door.


    un-BrE /ʌn/ 🔊NAmE /ʌn/ 🔊 prefix (in adjectives, adverbs and nouns 构成形容词、副词和名词) not; the opposite of 不；未；非；反◆unable不能◆unconsciously无意识地◆untruth虚假 (in verbs that describe the opposite of a process 构成表示相反过程的动词) ◆unlock开锁◆undo解开

    birth, breech birth, caesarean, contraction, deliver, induce, labour, midwife, obstetrics, umbilical cord