idiom-the language peculiar to a people or to a district, community, or class
A Bird In The Hand Is Worth Two In The Bush: Having something that is certain is much better than taking a risk for more, because chances are you might lose everything.
Back Seat Driver: People who criticize from the sidelines, much like someone giving unwanted advice from the back seat of a vehicle to the driver.Back To Square One: Having to start all over again.Back To The Drawing Board: When an attempt fails and it's time to start all over.