Beat around the bush
Avoid talking about something
Hit the sack
Go to bed
Like talking to a brick wall
Talking and no one is listening
Break a leg
Good luck
Talking until I'm blue in the face
Repeating something over and over
Hang in there
Don't give up
Its not rocket science
Its not hard
A dime a dozen
Something is common
Its raining cats and dogs
Its raining hard or a lot