Clocks in means to record one's arrival time at work or an event. The antonyms for clocks in would be to clock out or check out, which means to record the end of one's work shift or departure from an event. Other antonyms for clocks in could include missing or skipping, which means failing to record one's arrival time. Additionally, being late could also be an antonym for clocks in, as it means arriving after the designated time for attendance. Antonyms help to provide a complete understanding of a word by presenting its opposite meanings.