1. jawbone (anatomy)

2. face (figuratively, informal)

3. fool, numskull (figuratively, informal)

4. ganache (sauce made of chocolate and cream) (cooking)

5. The role of a stupid and gullible old man. (theater)

6. Padded armchair. (furniture)

7. cachexia, one of the symptoms of which is swelling under the mandible. (veterinary medicine)