There are several synonyms for the phrase "on deathbeds". Some of the common synonyms are "dying", "in their last moments", "in their final hours", "breathing their last", "at the end of life", and "on the brink of passing away". These synonyms all refer to the final stages of a person's life, when they are facing their mortality. While the language surrounding death can be difficult to navigate, it is important to express empathy and care for those who are facing the end of their lives, and to provide comfort to them and their loved ones as they transition into whatever may come next.