WhatsAppWiktionary 原文英美构词拆解Whatswhat's up词干Appapp词干词源说明Blend of what's up + app, coined as a trademark.释义专有名词proper noun1An instant messaging service founded in 2009 and acquired by Facebook in 2014.名词noun1A message sent via WhatsApp.2An account or number on WhatsApp.动词verb1transitiveTo contact (someone) via WhatsApp.