The phrase "keep in countenance" means to maintain or preserve one's dignity or composure. There are various synonyms one can use for this phrase including "maintain one's poise", "preserve one's honor", "keep one's self-respect", "uphold one's reputation", and "retain one's decorum". These synonyms can be used in different contexts such as when dealing with difficult situations or when faced with criticism. It is important to keep in countenance in order to be seen as composed and professional, especially in social or professional settings. Choosing the right synonym depending on the situation can help one communicate more effectively and leave a good impression on others.