Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: la

lo

 interjection
     
lo
1 old use used to tell someone to look at something that is surprising
2

lo and behold

spoken used before mentioning something surprising that happened - used humorously:
We had just been talking about John when, lo and behold, he walked into the room.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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