Stubborn As A Mule :
Someone who will not listen to other people’s advice and won’t change their way of doing things is as stubborn as a mule.
Stuck Up :
Stuff and Nonsense :
Stuffed To The Gills :
If someone is stuffed to the gills, they have eaten a lot and are very full.
Succeed In The Clutch :
If you succeed in the clutch, you perform at a crucial time.
It is particularly used in sports for the decisive moments of the game.
The opposite is FAIL IN THE CLUTCH.
Sum and Substance :
Sunday Driver :
A Sunday driver drives very slowly and makes unexpected maneuvers.
Sure As Eggs Is Eggs :
These means absolutely certain and we do say IS even though out is grammatically wrong.
If something is sure-fire, it is certain to succeed.
Swan Song :
A person’s swan song is their final achievement of public appearances.
Swear Like A Sailor :
Someone who is foul-mouthed and used bad language all the time swears like a sailor.
Swear Like A Trooper :
Someone who is foul-mouthed and uses bad language all the time swears like a trooper.