From Longman Dictionary of Contemporary Englishjawlinejaw‧line /ˈdʒɔːlaɪn $ ˈdʒɒː-/ noun [countable] the shape of the lower part of someone’s face a square jawline
Examples from the Corpus
jawline• He had short-cropped hair and a jawline lean and sharp enough to cut cake.• It covered the whole of her face, shaping to its contours and jutting out with an exaggerated jawline.• There are twin rivulets of sweat running from her temples to her jawline.• A faint stubble roughened his chin and just beneath his jawline was a small crescent-shaped scar.• Fiona, 43, had surgery earlier this year to tighten her sagging jawline.• Try tiaras and crowns and always wear hair below your jawline to create the illusion of length. 