A postal route, especially in a terrain or region in which communication is difficult.
Origin
Late 18th century; earliest use found in George Washington (1732–1799), revolutionary army officer and president of the United States of America. From post + line.
Definition of post line in US English:
post line
nounˈpəʊs(t)lʌɪn
rare
A postal route, especially in a terrain or region in which communication is difficult.
Origin
Late 18th century; earliest use found in George Washington (1732–1799), revolutionary army officer and president of the United States of America. From post + line.