Antonyms for "coming to berth" could include "departing from dock," "setting sail," "leaving port," or "embarking." Each of these phrases describes the opposite of "coming to berth," which involves a ship slowly approaching its berth or dock in order to dock safely. When a ship departs from its berth, it is typically reversing the same process it went through when it arrived at the dock. Instead of moving forward towards the berth, it moves away from it and out into the open water. Similarly, when a ship sets sail or leaves port, it is moving away from its berth and out on its voyage.