mainline
UK[ˈmeɪnlaɪn]US[ˈmeɪnlaɪn]
adj
Most important, established, or accepted; belonging to a principal or dominant group.
v
To inject a narcotic drug directly into a vein.
Morpheme Breakdown
main
line
main
principal
line
cord, route
Etymology
The word 'mainline' is a transparent compound formed from two robust English roots. 'Main,' derived from Old English 'mægen' (power), evolved to signify that which is primary or most significant. 'Line,' tracing back via Old English to Latin 'linea' (a linen thread), developed broad meanings related to routes, connections, and courses. When combined, the term first literally described a principal railway route. This core concept of being primary and directly connected was then metaphorically extended in the mid-20th century to describe the dominant, established faction in politics or society, and, in a starkly different context, the act of injecting drugs directly into a central vein, emphasizing a direct and potent connection.
Analysis
Structure: main (principal) + line (cord, route)
- main: From Old English 'mægen' meaning "strength, power," functioning as an adjective meaning "principal" or "most important."
- line: From Old English 'līne' meaning "cord, rope, series," from Latin 'linea' (linen thread), functioning as a noun meaning a route, course, or connection.
Examples
She is a mainline Protestant minister.
The debate was between mainline Republicans and the party's more radical wing.
The documentary showed the dangers of mainlining heroin.