The answers to the clues below will have something in common.

1. Rapid decline

2. Insincere agreement

3. Violin feature

4. Architectural ornament

5. Speeding driver's feature

6. Poker player's feature

7. Young woman with older man

8. Intellectual exodus

9. Lack of musical talent

10. Intentional unfriendliness

11. Impertinence

12. Trademark SCUBA staple

13. Assistance

14. Adequate space to move or work

15. Ability to eat anything without getting sick 

 

Answers:

 

1. Nosedive

2. Lip service

3. Chin rest

4. Dogtooth

5. Lead foot 

6. Stone face

7. Arm candy

8. Brain drain

9. Tin ear

10. Cold shoulder

11. Backtalk

12. Aqualung

13. Helping hand

14. Elbow room

15. Iron stomach - - - Expressions with body parts