danger n
   Comb danger bell: ship's bell rung as warning at night or in fog.
   [1822] 1891 SKINNER 55 We could carry but little sail [in the dense fog], and had to keep the danger bell going continually to prevent, if possible, our being run into. Q 71-7 ~ bell rung on a boat when out in fog as thick as pea soup. The danger bell serves as a warning for other boats in the area to avoid a collision.
   danger flag: flag hoisted on vessel to recall sealers from the ice.
   1924 ENGLAND 276 [caption under photo] Danger-flag going up, to warn men far on ice of approaching blizzard.

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