Salt

any [judge/lawyer/teacher etc.] worth their salt:  Any judge, lawyer, teacher etc. who is good at their
job. Any lawyer worth his salt should be aware of the latest changes in taxation. No judge worth her 
salt would attempt to influence the jury.

be the salt of the earth:  if someone is the salt of the earth, they are a very good and honest
person. His mother's the salt of the earth. She'd give you her last penny. 

go through someone/something like a dose of salts (old-fashioned):  if something you eat goes
through your body like a dose of salts, it goes through you very quickly. Those beans went through
me like a dose of salts. 

rub salt in/into the wound:  to make a difficult situation even worse for someone. Losing was
bad enough, having to watch them receiving the trophy just rubbed salt into the wound. 

take something with a pinch of salt (British & Australian, American & Australian):  if you take
what someone says with a pinch of salt, you do not completely believe it. You have to take
everything she says with a pinch of salt. She has a tendency to exaggerate. It's interesting
to read the reports in the newspapers, but I tend to take them with a grain of salt. 

Cambridge International Dictionary of Idioms © Cambridge University Press 1998

*****

salt away something:  to save something, esp. money, for use at a later time. It's not easy paying 
a mortgage, raising a young child, and salting away enough money for your retirement.

worth your/its salt:  someone or something that deserves respect. Virtually any wine shop worth its 
salt carries at least a few wines from New Zealand. Any judge worth his salt would immediately report 
an attempt to influence the jury.

Cambridge Dictionary of American Idioms © Cambridge University Press 2003
 

Source:  www.thefreedictionary.com