1. An exclamation used to express surprise, discovery, or sudden realization.
Usage: informal; often used when noticing something unexpected or when understanding something suddenly
2. An exclamation used to express triumph, mockery, or challenge.
Usage: informal; often used in a teasing or confrontational tone

Examples

• Oho! So that's where you've been hiding!
• Oho, I see what you're doing now.
• Oho, you think you're clever, do you?
• Oho! I finally understand the answer.
• Oho, caught red-handed!
• Oho, so that's the secret ingredient.