A Bird

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.

A Blessing In Disguise:

Something good that isn't recognized at first.

A Chip On Your Shoulder:

Being upset for something that happened in the past.

A Dime A Dozen:

Anything that is common and easy to get.

A Doubting Thomas:

A skeptic who needs physical or personal evidence in order to believe something.

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.

Baker's Dozen:

Thirteen.

Barking Up The Wrong Tree:

A mistake made in something you are trying to achieve.

Can't Cut The Mustard :

Someone who isn't adequate enough to compete or participate.

Cast Iron Stomach:

Someone who has no problems, complications or ill effects with eating anything or drinking anything.

Charley Horse:

Stiffness in the leg / A leg cramp.

Chew someone out:

Verbally scold someone.

Chip on his Shoulder:

Angry today about something that occured in the past.

Dark Horse:

One who was previously unknown and is now prominent.

Dead Ringer:

100% identical. A duplicate.

Devil's Advocate:

Someone who takes a position for the sake of argument without believing in that particular side of the arguement. It can also mean one who presents a counter argument for a position they do believe in, to another debater.

Dog Days of Summer:

The hottest days of the summer season.

Don't count your chickens before they hatch:

Don't rely on it until your sure of it.