The idiom "cutting edge" refers to something or someone that is at the forefront of innovation, technology, or knowledge in a particular field. It implies something new and forward-thinking, often pushing boundaries or challenging traditional ways of thinking.

The idiom "best thing since sliced bread" is used to describe something that is considered an excellent new development or improvement. It can be used to praise a product, a service, or a person's performance. It indicates that the new thing is widely appreciated and has become popular.

The idiom "say what" has multiple meanings, but generally, it is used to express surprise or disbelief. It can also be used to encourage someone to speak up or say something they have been hesitant to share.

The idiom "curiosity killed the cat" is a figurative expression that means an innocent person or thing may be harmed because someone has become too curious or inquisitive about it.

"On the horizon" is an idiom that means something or someone is about to happen, occur, or appear in the near future. It's often used to describe a situation that's not yet certain but has potential to be significant or impactful.