the salt shaker was empty that night, so jimbo rubbed a finger across his brow and licked some brow salt before each bite
the white salty powder that accumulates on the eyebrows during the day, particularly if one has especially active sweat glands
"the salt shaker was empty that night, so jimbo rubbed a finger across his brow and licked some brow salt before each bite" What is the definition of "brow salt"?