When it comes to expressing the idea of working late, there are various synonyms that can be employed to describe the concept. Here are a few alternative phrases that can be used instead of "work late". "Burn the midnight oil" is an idiom that conveys working late into the night. "Put in long hours" is another option that conveys the idea of working for an extended duration. Similarly, "stay behind" and "pull an all-nighter" can be utilized to indicate working beyond usual working hours. "Overtime" and "late shift" are more contextual phrases that signify the period of additional work beyond regular timings. Lastly, "work extra" and "put in extra time" are simple and straightforward ways of indicating the act of working beyond the usual work schedule.