"Be upstanding" is a phrase that describes standing up to show respect, usually in formal situations such as when a judge enters the court or during the national anthem. If you're looking for synonyms for this phrase, there are many to choose from. Some alternatives include "be standing," "stand up," "rise," "get to your feet," "stand erect," or even "assume a standing position." All of these phrases convey the same idea of standing up as a sign of respect and politeness. Whether you use "be upstanding" or one of these synonyms, the message remains the same: show respect by standing up.