Definition of lo exclamation from the Oxford Advanced Learner's Dictionary

 

lo

 exclamation
exclamation
BrE BrE//ləʊ//
 
; NAmE NAmE//loʊ//
 
(old use or humorous)
 
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  • used for calling attention to a surprising thing An extra skittle was added and, lo, tenpin bowling was born.
  • Word Originnatural exclamation: first recorded as in Old English; reinforced in Middle English by a shortened form of loke ‘look!’, imperative of look.Idioms (humorous) used for calling attention to a surprising or annoying thing As soon as we went out, lo and behold, it began to rain.
    See the Oxford Advanced American Dictionary entry: lo