bump up
v. phr.— «He lauded the five killed in the Esperanza Fire as among the most trusted and urged their loved ones to “bump up,” a common firefighting term meaning “move forward.”» —“Firefighters pay tribute to 5 ‘brothers’” by Stacia Glenn in Devore San Bernardino County Sun (California) Nov. 6, 2006. (source: Double-Tongued Dictionary)
Further reading
A firefighter named Steve in Newport News, Virginia, wonders why in his line of work, and for some police, certain additional kinds of days off after long unbroken shifts are called Kelly days, Kelly shifts, or Kelly time. The term most likely comes...
Visiting firemen doesn’t necessarily refer to firefighters. The terms visiting fireman and visiting firemen may refer to any of several types of visitors from out of town, including non-firefighting celebrities, tourists, and rowdy conventioneers...