The phrase "calls it a day" is often used to signify the end of the day or work shifts. However, there are numerous phrases that can be used as antonyms for this phrase. Some common antonyms include "starts the day," "begins the shift," "extends the workday," or "works through the night." These antonyms imply that the work or day has just begun and highlight the expectation of continuing the activity. In contrast, the phrase "calls it a day" brings a sense of closure, signaling the end of a period of work and the opportunity to rest or engage in other activities.