A "writeup" refers to a document or an article that briefly explains or describes something, often providing details or summaries about a specific topic, event, or situation. Full definition
The Points Guy has a good writeup on how to increase your chances. (globetrotterhq.com)
There's a great writeup of what this means over on video game industry analyst ZhugeEX's blog, if you're interested. (eurogamer.net)
StratFor has several good writeups on the topics of China and leadership of the country in current and historical contexts (politics.stackexchange.com)