Losing face usually comes directly or indirectly from embarrassing people, criticizing something that bring people shame or damage their professional reputation. Our main suggestion is to avoid giving harsh criticism.
But other behaviors such as giving someone a gift that is beneath their status, turning down an invitation or a gesture of friendship, not keeping your promises, showing anger or other inappropriate emotions are also to be avoided.
For actual phrases and more information, please check out Chapter 9 Business Etiquette!