Synonyms for the expression "change direction abruptly" include veer, swerve, turn unexpectedly, shift, deviate, dart, twist, zigzag, pivot, skid, slew, curve, meander, and veer off. Each of these words describes a sudden movement or adjustment in course or direction. Depending on the context, these terms can also imply urgency, surprise, or danger. For instance, swerve or skid often suggest a sudden and unexpected change in direction caused by an outside force or factor, while veer or curve may imply a more calculated or deliberate change. Overall, the variety of synonyms available for this phrase demonstrates the richness and flexibility of the English language.