Sentence:  "Let's have a <WSD>line</WSD>." He pulled a razor blade from his pocket and scooped out a couple of mounds. He laid out seven thick <WSD>lines</WSD> on a mirror. He rolled up a fifty-dollar note and snorted a <WSD>line</WSD>. 
Meaning of the word marked with <WSD> tags:  A small portion or serving of a powdery illegal drug.