second-line
UK[ˈsɛkənd laɪn]US[ˈsɛkənd laɪn]
adj
Used or available as a substitute or alternative when the primary or preferred option is not available.
adj
Relating to or denoting treatment, especially for a disease, that is given after the initial (first-line) treatment has failed or cannot be used.
Morpheme Breakdown
second
line
second
following
line
series
Etymology
The compound "second-line" is a modern formation built from two deeply rooted English words. "Second" originates from the Latin sequi (to follow), with secundus literally meaning "the following one." "Line" derives from the Latin linea, referring to a linen thread, which extended metaphorically to any continuous series or arrangement. In military terminology, a "second line" historically referred to troops held in reserve behind the front line. This concept of a backup or supporting series was logically extended into medical and general contexts in the 20th century, where it now denotes a secondary option employed when the primary one is unsuitable or ineffective.
Analysis
Structure: second (following) + line (series)
- second: From Latin secundus (following, next), via Old French. Functions as a numeral/adjective meaning "next after the first."
- line: From Latin linea (linen thread, string, line), via Old English līne. Functions as a noun meaning "a connected series."
Examples
This antibiotic is considered a second-line therapy for resistant infections.
We keep a second-line supplier on contract in case of emergencies.
The coach promoted several second-line players to the starting team.