It's not rocket science
It's not complicated
Pull someone's leg
To joke with someone
Pull yourself together
Calm down
Under the weather
Sick
Wrap your head around something
Understand something complicated
We'll cross that bridge when we come to it
Let's wait to talk about that problem until we get closer to the time
A penny for your thoughts
Tell me what you're thinking
A picture is worth 1000 words
Better to show than tell
Actions speak louder than words
Believe what people do and not always what they say
By the skin of your teeth
Just barely
Give someone the cold shoulder
Ignore someone
Let the cat out of the bag
Give away a secret
On thin ice
If you make another mistake, there will be trouble.
Once in a blue moon
Rarely
Put something on ice
Put a project on hold
Rain on someone's parade
To spoil something
