Explanation:

- Reiterate: This means to say or do something again, often for emphasis or clarity.

- Option 1: Rescue from loss: This refers to saving something or someone from losing something valuable. Not related to repeating or stating again.

- Option 2: Slavish: This describes something that unintelligently or blindly follows something else, like an imitation. Not synonymous with reiteration.

- Option 3: Confident: This means having self-assurance or certainty. It doesn't relate to doing or saying something repeatedly.

- Option 4: Repeat: This is to do or say something again, similar to reiterate.

The nearest synonym for "reiterate" is Option 4: Repeat.