To cost an arm and a leg
To be very expensive.
To be in the same boat
To be in the same position or unpleasant situation as other people.
To be or feel under the weather
To not feel well.
To be tickled pink
To be very happy.
To be a loose cannon
To be unpredictable.
To keep someone's chin up
To be happy.
Rise and shine
Wake up and be happy!
To be/feel down in the dumps
To be or feel sad or depressed.
To be Greek to somebody
To be impossible to understand.
Till the cows come home
For a very long time.
To get a slap on the wrist
Give someone a mild punishment.
Close, but no cigar
You were close, but you didn't make it.
To hold someone's horses
To be patient and wait.
To be as sick as a dog
To be very sick.
To pull someone's leg
To be just joking.
Hands down
Without competition.