Out of the loop
Not included
Joined at the hip
very close to someone
Cool as a cucumber
calm even in a difficult situation
When pigs fly
something you think will never happen
Hanging by a thread
to be in a bad situation/almost failing/barely holding on
Get the picture
to understand
All eyes and ears
Listening very closely
Pull someone's leg
to joke with someone
Hit the books
begin to study
On the same page
thinking similarly/understanding each other