划线 literally means 'to draw a line' — combining 划 (huá), meaning 'to scratch, to draw, or to mark', and 线 (xiàn), meaning 'line'. It refers to the physical act of drawing a straight or curved line on paper, a board, or other surfaces using a pen, pencil, ruler, or stylus. This term is commonly used in academic, office, and everyday contexts — for example, when highlighting text, marking corrections in documents, or sketching diagrams.

While 划线 can describe any deliberate line-drawing action, it often implies purposeful marking rather than artistic drawing; thus it’s frequently found in instructions like '请在此处划线' ('Please draw a line here') or in educational settings where teachers ask students to underline key words or separate sections. It does not refer to digital highlighting unless explicitly extended metaphorically, and it’s distinct from painting or calligraphy strokes.