The phrase "valiant stand" means to courageously fight or defend something, even if the chances of success are low. It describes a brave and determined effort to resist or withstand a difficult situation. Full definition
Over 100 trillion of these teeming microbes take up residence in the gastrointestinal (GI) tract, where they are hard at work tearing apart food to extract useful vitamins and minerals, and taking a valiant stand against dangerous pathogenic invaders when needed. (wellnessmama.com)
Matt Damon is leading an elite force that's making a valiant stand for humanity on the world's most iconic structure in the new official trailer, poster and stills for the upcoming thriller, «The Great Wall.» (shockya.com)
Aizawa was the one who suggested this to you, and now you're posing as if it's some valiant stand you've brainstormed to right their unthinkable wrongs. (blog.us.playstation.com)