Definition of show up phrasal verb from the Oxford Advanced American Dictionary

 

show up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

show up

(informal)
 
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to arrive where you have arranged to meet someone or do something It was getting late when she finally showed up.

show up

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show somethingup

 
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to become visible; to make something become visible a broken bone showed up on the X-ray The harsh light showed up the lines on her face.

show somebodyup

 
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to make someone feel embarrassed by doing something better than them Don't worry about being shown up by the kids—they've always used computers.
See the Oxford Advanced Learner's Dictionary entry: show up