||the person/horse/team that is certain to win, a sure thing
||Ralph's a shoo-in to win the next election. He'll win easily.
|a short one
||a small drink, a small amount of liquor
||"Can I pour you a drink?" "Yes. A short one, please."
|a shot in the arm
||energy, encouragement, a lift
||Billy Graham's sermon was inspiring - a shot in the arm.
|a shot in the dark
||a wild guess, a try, hazard a guess
||His answer was incorrect. It was a shot in the dark.
|a sick building
||a building with polluted air or insufficient oxygen
||This is a sick building. The air contains toxic fumes.
|a sight for sore eyes
||something or someone you are happy to see
||Well, my friend, you are a sight for sore eyes. Good to see you!
|a silver spoon...
||(See born with a silver spoon in his mouth)
|a sitting duck
||an easy target, a person who is easy to deceive
||The old lady was a sitting duck for the salesman. It was an easy sale.
|a slim chance
||very little chance, not likely to happen
||"Is it going to rain today?" "Maybe. There's a slim chance."
|a slip of the tongue
||a spoken error or mistake, a word that slips out
||I said brew instead of blue. It was a slip of the tongue.