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English definition of “open up”

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open up

verb [I/T] phrasal verb with open  /ˈoʊ·pən/ us  

(LET IN)

(used as an exclamation) let me in; open the door: "Open up!" Sam shouted, banging on the door.
(Definition of open up phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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