Use when new facts bolster a belief or argument you're discussing. The eyewitness account lent credence to the theory of a third suspect.
Pro Tip 2/3
Not Proof
Remember 'lend support' doesn't mean prove, it means it makes the idea more believable. Her alibi lent weight to her claim of innocence, though it wasn't definitive proof.
Pro Tip 3/3
Impartiality
The phrase often implies objective evidence rather than personal opinion. Recent studies lend support to the benefits of a plant-based diet.