What does the idiom "break the ice" mean precisely?

Cut the tension between you and your speaking partner

Loudly exclaim your point to your conversational partner

In which situation can the idiom "hit the nail on the head" be used?

When your chess partner strikes a new move

When someone hurts another person by accident

When someone utters the exact solution or answer to a problem

I bet this quiz was a piece of cake for you! How was it?

Yes, I do agree that this quiz was fairly easy for an intermediate English speaker.

More like a piece of hard candy that's impossible to chew on.

Now you're wondering why I'm altering this quiz out of the blue. I hope you're keeping it as cool as a cucumber, but can you tell me what the idiom "chicken out" means? :)

Nice one. My guess is that it means to go cold turkey

Easy. The last idiom is used towards people who shy away from a risky task. Same as ducking out

Are you giving your blood, sweat and tears or slacking off? Give explanation to both of these idioms

To do something with tremendous amount of effort and to do something with barely any effort