This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

To outshine; excel in brilliancy.

To flash out.

"The two sites have been head to head in terms of unique visitors for years, with a slight lead for holiday campaign proved to "outflash" Snapfish, magnetizing almost double the users to its holiday, gifts and cards sections on the site."

outclass    outflank    outlast    outwash