Scrimp and save
To be very thrifty, to save money for something.I have been scrimping and saving in order to buy a new computer.
Screw up one’s courage
To build up one's courage for something.I screwed up my courage and asked my supervisor to transfer me to a different department.
Screw up (someone or something) screw (someone or something) up
To cause trouble for someone or something, to make a mess of something.My travel agent screwed up my travel schedule and I missed my flight.
Scale (something) down
To make something smaller.The government decided to scale down the plans for the sports stadium.
Shake in one’s boots
To be afraid, to shake from fear.The little boy was shaking in his boots when the large dog approached him.
Shake hands with (someone)
To shake the hand of someone to greet them.I shook hands with my neighbor when I first met him.
Shake (hands) on (something)
To shake the hand of someone as a sign of agreement about something.I shook hands on the agreement with my boss.
Shake a leg
To go fast, to hurry."Please try and shake a leg. We are already late for the concert."
Shadow of oneself/itself
Someone or something that is not as strong or healthy as before.The professional boxer was a shadow of his former self.
Shades of (someone or something)
A reminder of someone or something.The festival contained shades of the large festivals of many years ago.