By extension, used to indicate that which is unknown or uncertain, particularly if it seems to carry some type of risk.
Related
Similar words
here be monsters
there be dragons
Origin
Evidence of the use of this term as a notation on actual historical maps is lacking. The only known appearance of an equivalent phrase in any language on a historical map is of Latin hic sunt dracones, placed on the east coast of Asia, on the Hunt-Lenox Globe, which dates from c. 1510. The phrase is simply a variation on HIC SVNT LEONES ("here are lions"), the classical phrase used by medieval cartographers to denote unknown territories on maps.
Modern English dictionary
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