The phrase "again show up" is correct and usable in written English.
It can be used when referring to someone or something that appears or arrives once more after a previous occurrence.
Example: "After a long absence, she decided to again show up at the meeting to share her insights."
Alternatives: "reappear" or "come back again".
Another nod to more recent vintages of "Macbeth" is evident in those sinister muses, the three witches (Myra Lucretia Taylor, Starla Benford and Kelly Hutchinson), who again show up as battlefield scavengers, Mother Courage types gone toxic.
I mean, how dare she, time and time again, show up to a family gathering without a man on her arm?
I can show up doubting my ability -- but I will never again show up timid and uncertain of my place in this world, wherever my feet may take me, where I belong.
If you click "Never for this site", the bar will never again show up when logging into that site.
This once again shows up the scant respect it has for democratic values".
Zombie Reagan walks again Shows up to stomp all over the Evil Empire and generally take credit for the end of the Cold War.
On a more informal level, break dancing and its variations -- popping and beat dancing -- are once again showing up at parties, clubs and raves.
Her iconic shrunken multi-zippered jackets once again showed up with equally small stretch skirts in both user-friendly sandy beige and traffic-stopping orange.
MOSCOW — The president of the World Chess Federation, an eccentric Russian millionaire who last year tried to negotiate a settlement in Libya's civil war, has again shown up for talks with a faltering dictator.
If, for instance, a Facebook user makes a purchase at Fandango, a website that sells cinema tickets, this information again shows up on the news feeds of his friends on Facebook, who might decide to come along.
Google/Samsung's well-leaked follow up to the Nexus One — the Nexus S — has once again shown up in some super-secret spyshots, this time, however, we're treated to a close-up look at its curved display.
