General Brazilian
relaxar, esfriar, geladão
Most common usage, informal contexts
Rio de Janeiro
relaxar, maneirar
Colloquial, 'to chill out' often translates to 'maneirar'
São Paulo
relaxar, ficar tranquilo
Standard modern usage among younger speakers
Portugal
arrefecer, acalmar-se, geladão
Less informal than Brazilian usage; more formal alternatives preferred