S idioms

• Safe and sound*
• Second nature*
• Second to none*
• See eye to eye*
• Shake a leg*
• Sharp as a tack*
• Sick and tired
• Sink or swim*
• Six to one, half a dozen of the other*
• Sixth sense*
• Smart Aleck*
• Smell a rat*
• Soap opera*
• Song and dance*
• Sore spot/point*
• Spick-and-span*
• Sponge off*
• Stuffed shirt*
• Sweet tooth*