Safe and sound 
          : Completely save

Second to none
          : The best

Slip one's mind
          : Completely forget something

Smell a rat
          : Compete with someone

Shoot off the mouth
          : Show opinion very loudly

Stick out the neck
          : Take the risk

Shake a leg
          : Hurry up

Sell someone down the river
          : Betray someone

Snow job
          : Dishonesly talking

Sooner or later
          : In the near future

Stand me up
          : Miss an appointment with me.