"To break the ice" means:
to start a conversation in a formal setting
to be cold-hearted
to fall through thin ice
"To be a piece of cake" means:
to be very difficult
to be very easy
to be very delicious
"To break a leg" means:
to fall down and hurt oneself
to wish someone good luck before a performance
to have a serious injury
Once in a blue moon
Something that rarely happens or doesn't happen often
Feeling under the weather
Not feeling well, feeling sick or not yourself
That costs an arm and a leg
It's very expensive, costs a lot of money
Let's break the ice
Start a conversation or say something in a social setting
Every cloud has a silver lining
Something good will come out a bad situation
I am all ears
You have their attention, they are listening to you
They got cold feet
They are feeling nervous
The ball is in your court
The decision or choice is yours
