Antonyms for the phrase "am on duty" include phrases like "off duty," "not working," or "on vacation." The opposite of being actively engaged in work or responsibilities related to a job, being "off duty" implies a state of rest, relaxation, or freedom from obligation. While "am on duty" suggests full commitment to a particular role, being "off duty" grants an individual permission to set aside work-related concerns and attend to personal needs or interests instead. In some cases, the antonyms for "am on duty" may imply a sense of detachment or disinterest, whereas "am on duty" implicitly denotes a sense of purpose, awareness, and responsibility.