CHILLAX Meaning of CHILLAX in English chil ‧ lax /tʃɪˈlæks/ BrE AmE verb [intransitive] informal to relax and be calm – used especially by young people:Dude, just chillax. —chillaxed adjective Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012