face-plant

/ informal /

verb

(intr) to fall onto one's face, esp when skiing or snowboarding

noun

an act or instance of falling onto one's face
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012