As a Noun: 1. A long thin mark on a surface or something that looks long and thin. English = line. 2. A long stripe or mark on a surface. English = streak. 3. A line drawn under a word in a written or typed text. As a Verb or Adjective: 1. To draw or make a line on a surface. 2. To make streaks on a surface. English = streak. 3. To draw a line under a word or words in a text. English = underline.