Overlining

Part of speech: noun, verb

Definitions

1. The act of drawing a line above letters, words, or symbols to indicate emphasis or denote a special meaning ; applying a markup feature that places a horizontal line atop text or characters for highlighting or correction ; the process of marking text with a bar over it to signify negation, abbreviation, or stress in written or printed material
2. Creating a horizontal stroke over characters or words to provide emphasis or clarify intention ; utilizing a typographical style where lines are placed above content for annotation or distinction ; employing a method of placing a line atop text elements as a form of expression, indication, or correction in documents or designs
3. The action of placing a continuous horizontal line above letters or numbers to denote importance, repetition, or mathematical complement ; marking text with an upper line as a visual cue for specific interpretation or speech emphasis ; adding a bar above writing as a conventional way to highlight, negate, or abbreviate within various forms of communication

Etymology: "Overlining" is the present participle and gerund of "overline", a verb formed from "over-" and "line" on the model of "underline". The pairing is simple: where "underline" marks a line beneath text, "overline" places the same kind of stroke above it, so the formation is transparent rather than surprising. The prefix "over-" here means "above" or "on top of", the same sense it carries in words like "overhead" or "overhang", while "line" supplies the mark itself. Because the verb is built directly from two English parts, it needs no borrowed root, and the existence of "underline" first gave speakers the pattern to follow.