Meaning of testify

tes•ti•fy

1. to bear witness; give or afford evidence.
2. to give testimony under oath or solemn affirmation, usually in court.
3. to make solemn declaration.

1. to bear witness to; affirm as fact or truth; attest.
2. to give or afford evidence of in any manner.
3. to state or declare under oath or affirmation, usually in court.
4. to declare, profess, or acknowledge openly.