出典:Wiktionary
First known attestation from 1880 where the term was described as being used "because no matter what [the Indians] have done [committed crimes] upon one side they feel perfectly secure after having arrived upon the other".[1][2] A synonymous term which was attested earlier is medicine road from 1869 and ostensibly a calque of a Sioux term transcribed as "pejuta canku".[1] Unrecorded use of the term or a similar one may date back more than a century earlier than the first attestation.[1] See also medicine (“protective charm among the Native Americans”).
Primarily used in the context of discussions of Native Americans or First Nations people.