hard·hat or hard-hat  (härd'hāt') 
n. A lightweight protective helmet, usually of metal or reinforced plastic, worn by workers in industrial settings. Informal A construction worker. An ultraconservative. An extremely patriotic person with a conventional, usually unquestioning sense of morality.
Slang An ultraconservative. An extremely patriotic person with a conventional, usually unquestioning sense of morality.
adj. Relating to heavy industry, construction, or demolition. Informal Of, relating to, or characterized by extreme conservatism. Slang Extremely patriotic.
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