1. throw down the gauntlet - Verb
2. throw down the gauntlet - Phrase
throw down the gauntlet (third-person singular simple present throws down the gauntlet, present participle throwing down the gauntlet, simple past threw down the gauntlet, past participle thrown down the gauntlet)
(idiomatic) To issue a challenge.
Google will throw down the gauntlet for Amazon Web Services this year with new two new features in Google Compute Engine, industry sources said. Source: Internet
Should I throw down the gauntlet at Stephen King and write a horror tale? Source: Internet