The phrase "under the gun" refers to a situation where someone is under pressure to complete a task within a given time frame or with specific requirements. Some synonyms for this phrase include "in a tight spot," "on the clock," "in the hot seat," or "under the wire." Each of these phrases is meant to convey a sense of urgency or stress in completing a task or job. Other synonyms for "under the gun" might include "in the crosshairs," "on the firing line," or "in a bind." Whatever the terminology used, the meaning is clear: there is a deadline looming, and there is a sense of urgency to get the job done.