Common bond

All of these answers share a common bond. Can you deduce what it might be?

-1. ballparks?
-2. educate
-3. resolute
-4. logic
-5. wedding give away
-6. speaker
-7. humiliate
-8. Blue Jays habitat?
-9. Schwarzenegger witness protect movie title
-10. optical instrument using mirrors to offset the line of sight
-11. Notre Dame for example
-12. to fix deeply or indelibly, as in the mind
-13. it can be sweetheart, square or plunging
-14. scrutable
-15. bashful

9.Eraser

13. neckline

13. neckline

Flo beat me to it, so

12. ingrain

8. Toronto

3. steadfast

6. Orator (Hi Cue - I'm watching those vowels ?

Bernie

Good answers everyone

The vowels look good so far, Bernie, but that's not it.

2. prepare

7. degrade

Hi Cue.

15. sheepish

1. estimates

manxman and Sondi

Good on #7, Remi but not #2

11. church

2 - indoctrinate

2. enlighten

Same 2 letters front and back

4. sense

Yes, Cheryl gets the nod for #2.

Looks like you found it, Flo

10. periscope

Yes!

5. centerpiece

14. legible

Michele and Koala, excellent!