I have never heard this. It's usually 'like a dose of salts', meaning fast and thoroughly.
'She arrived with a basket of cleaning supplies and went through the house like a dose of salts.'
Fools gold [pyrite] does not come in flakes like slate but is randomly shaped and cannot come cleanly off in flakes.
it is green and shaped like a leaf
cloroform is like a sleeping dose
why dose not nitrogen from penta-halides like phosphorus
like.... tangerine-ish
That IS a sentence.
I had to drop that project like a hot potato when I found out about all the issues with it.
Leaders like her are a dime a dozen.
A False friend is just like a snake in the grass.
The teacher looked at the student with scorn after catching them cheating on the test.
There are no idioms in this sentence. If something is "like ___" or "as ___ as ___" then you are looking at a simile. Think "similar" and you can remember simile.
The idea that lightening was electricity struck Ben Franklin like a bolt from the blue.
It's not an idiom. It's just a sentence -- to be young again means that you are once more younger in age. This can be literally -- like in a science fiction time travel story -- or it can be figurative -- like your mind is young again.
An idiom is a phrase that appears to make sense, but actually has another meaning. If the sentence makes sense, but seems to mean something besides what it looks like, then it is an idiom. "Frank kicked the bucket" makes perfect sense, and when you realize that it means "Frank died," you have two different meanings.
idiom means expression like a page in a book
It's not an idiom. It means exactly what it looks like.
Fools gold [pyrite] does not come in flakes like slate but is randomly shaped and cannot come cleanly off in flakes.