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