| Idiom | Meaning | Example | 
| sabre rattling | 
(See rattle sabres)
 | 
 | 
| sack of hammers | 
(See a sack of hammers)
 | 
 | 
| sack out | 
sleep,  catch some z's, crash
 | 
If you bring your sleeping bag, you can sack out on the floor.
 | 
| sacred cow | 
protected part, the part that must not be changed
 | 
If our company is going to change, everything should be evaluated - no sacred cows.
 | 
| sacred moose | 
(a sacred cow in Canada)
 | 
 | 
| sad sack | 
(See a sad sack)
 | 
 | 
| saddle up | 
put a saddle on a horse, place a saddle on a horse
 | 
Let's saddle up and ride our ponies to the river.
 | 
| saddled with | 
burdened with, responsible for
 | 
She doesn't want to be saddled with a bus load of teen-age boys.
 | 
| salt away | 
save a little money each month, save tiny amounts
 | 
By the time Jake died, he had salted away about $50,000.
 | 
| salt of the earth | 
(See the salt of the earth)
 | 
 |