‘脱轨’ literally means ‘to come off the track’—‘脱’ (tuō) means ‘to remove, detach, or escape’, and ‘轨’ (guǐ) means ‘rail’ or ‘track’. Together, they describe the physical event of a train or tram leaving its rails. This word is commonly used in transportation safety reports, news headlines, and engineering discussions.

Figuratively, ‘脱轨’ extends to abstract contexts: it describes something deviating from an expected path, plan, norm, or moral standard—such as a relationship, career, policy, or personal behavior going off course. It carries a slightly negative connotation, implying loss of control, misalignment, or serious deviation. While often used in formal writing and media, it’s also common in everyday speech when discussing life choices or societal trends.