The phrase "saw one in court" can refer to witnessing someone in a legal setting or encountering someone unexpectedly in a public place such as a courthouse. Some synonyms for this phrase include "spotted in court", "encountered in the legal system", "witnessed in front of a judge", and "observed during a trial". Additionally, one could use the slang terms "busted" or "caught red-handed" to describe someone who has been seen in court, often implying guilt or wrongdoing. Overall, there are many ways to describe seeing someone in a legal setting, each with their own connotations and nuances.