Etymology
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show up (v.)

1826, "to disgrace through exposure," see show (v.) + up (adv.). Meaning "to put in an appearance, be present" is from 1888.

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Definitions of show up

show up (v.)
appear or become visible; make a showing;
Synonyms: come on / come out / turn up / surface
show up (v.)
be or become visible or noticeable;
Synonyms: show
From wordnet.princeton.edu