Meaning of LO in English

LO

/ ləʊ; NAmE loʊ/ exclamation

( old use or humorous ) used for calling attention to a surprising thing

IDIOMS

- lo and behold

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WORD ORIGIN

natural exclamation: first recorded as lā in Old English ; reinforced in Middle English by a shortened form of loke look! , imperative of look .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.