overlineEtymologyFrom over- + line, by analogy with underline.overline means passing over a railway line. Lexicurio rates it Sui generis — a strength score of 87 out of 100.adjPassing over a railway line.“The greatest number of bridges requiring modification are overline bridges, and many methods are adopted in reconstructing and altering them to give increased clearances.”nounSynonym of overbar.verbSynonym of overbar.