ขายขี้หน้า/เสียหน้

For many westerners the concept of 'losing face'/'saving face' is something strange and unusual, as for many of us before coming to asia it was a novel concept. However, here in lots of asian countries it's very important for the locals to maintain the harmony and not to lose face or make other people lose face. Often in Thailand, you may hear the term 'sĭa nâa ' เสียหน้ used as an equivalent of 'losing face' 
and when you hear this you just hope Thais aren't talking about you. 
In Taiwan, the concept of face is also important and maintaining the harmony.