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bee-line (n.)

also beeline, "straightest line between two points," 1830, American English, from bee + line (n.), in reference to the homing of bees in the field.

TO LINE BEES is to track wild bees to their homes in the woods. One who follows this occupation is called a bee hunter. [Bartlett, 1859]

The verbal phrase line bees is attested from 1827.