There are a variety of synonyms for the phrase "altered the course". Some options include "changed direction", "diverted from its original path", "shifted its trajectory", "adjusted its course", "redirected its route", "modified its pathway", and "deviated from its intended course". These phrases all imply a change in direction or a shift away from the expected path, often due to external circumstances or intentional steering. Whether applied to physical objects or metaphorical journeys, these synonyms convey a sense of redirection or adjustment that can have significant consequences.