Answer:

PROVE

Answer	Crossword Clue
PROVE	Verify
PROVE	Establish indisputably
PROVE	Establish the truth of

PROVE	More than allege
PROVE	Leave no doubt about
PROVE	Offer conclusive evidence about
PROVE	Turn out
PROVE	Show beyond doubt
PROVE	Establish
PROVE	Leave no doubt
PROVE	"... it!"

PROVE	Demonstrate
PROVE	Demonstrate decisively
PROVE	Show to be true
PROVE	Substantiate
PROVE	Show definitively
PROVE	Establish beyond a reasonable doubt
PROVE	Show conclusively
PROVE	Establish beyond doubt

PROVE	Show as true
PROVE	Show how or why
PROVE	Erase all doubt about
PROVE	Demonstrate as true
PROVE	Establish as fact
PROVE	Make it stick, so to speak
PROVE	Give evidence
PROVE	Show true

PROVE	Establish the authenticity of
PROVE	Show for sure
PROVE	Validate
PROVE	Test.
PROVE	Try out.
PROVE	Verify.
PROVE	Demonstrate.
PROVE	Subject to a testing process.

PROVE	Turn out to be.
PROVE	Turn out (to be).
PROVE	Furnish evidence
PROVE	Confirm
PROVE	Establish the truth