line-by-line

the phrase "line-by-line" is a modern english compound formed through the straightforward combination of common words. "line" originates from the latin linea, meaning "linen thread, string, line," derived from linum ("flax"). the preposition "by" comes from old english bī, meaning "near, in, during," from proto-germanic bi. the construction follows the english pattern of creating hyphenated compounds to describe a meticulous, sequential process, literally meaning "line by line." its logic is transparent, directly reflecting the methodical action of dealing with text or items one unit after another, preserving the core spatial and sequential meanings of its constituent words.

this is a compound phrase formed from three independent english words: "line", "by", and "line". it functions as a fixed adverbial or adjectival phrase.