Monday hammer
 n.— «Monday hammer. A 32 pound sledge hammer; means worker must have day of rest before being able to wield heavy hammer.» —“[pencil] Motormen and Conductors” by Workers at 3rd Ave. and 65th St., carbarn in New York City Lexicon of Trade Jargon , 1938-39. (source: Double-Tongued Dictionary)

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