double-hatter
n.β Β«Ontarioβs fire marshal has launched an investigation into whether public safety is at risk as a result of the resignations of “double-hatters.”…Rural forces are being compromised by the unionβs bid to stop professional firefighters from volunteering outside the city on their own time, a practice known as “double-hatting.”Β» ββFire marshal alarmed at loss of volunteer” by David Gonczol Ottawa Citizen (Can.) Nov. 4, 2005. (source: Double-Tongued Dictionary)