Inside these sets of words, you'll find a pair of smaller words.
By putting "&" between them, lo & behold, you'll make a familiar phrase.
For example, "thighbone / swallowtail" conceals "high & low".
Good Luck!
1. skyrocketing / trolleyman
2. thermometer / apoplexy
3. Delaware / bordering
4. surprised / trashiness
5. throughout / stumblebum
6. Gulliver / clearness
7. tragicomedy / pentagon
8. chinchilla / Magdalene
9. terrestrial / ecoterrorist
10. thundershower / intellectual
11. firecracker / misconstruing
12. blockbuster / doohickey
13. shunting / bespeckled
14. proliferation / climbable
15. heartstrings / consciences