English
guardline
From guard + line.
Proto-Germanic *wardāną ‘to guard, protect’
…
Early Medieval Latin wardō
Old French guarder ‘to protect, guard’
Old French guarde ‘protection; guard’
Middle English garde ‘guardianship’
English guard
Proto-Germanic *līną ‘flax’
Proto-Germanic *līnǭ ‘line’
Proto-West Germanic *līnā ‘line’
Old English līne ‘line’
Middle English line ‘rope’
English line
Today it means
noun A defensive line of human guards, barriers, etc.
Language periods are conventional ranges, not dates for this word.
Etymograph / guardline