double-hatter
n.— «Ontario’s 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 union’s bid to stop professional firefighters from volunteering outside the city on their own time, a practice known as “double-hatting.”» —“Fire marshal alarmed at loss of volunteer” by David Gonczol Ottawa Citizen (Can.) Nov. 4, 2005. (source: Double-Tongued Dictionary)
Further reading
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