A person with thin skin is easily insulted, very sensitive , thinks every negative comment is aimed at him and takes every criticism in the worst way.
I think you heard the idiom wrong. It should be "by the skin of her teeth," meaning that she barely succeeded.
The idiom you have alluded to means to be placed precariously or unfavourably in a situation. The American expression "skating on thin ice" has a meaning that is synonymous and can be used interchangeably with the idiom in question.
A thin skin or film., A thin film formed on the surface of an evaporating solution.
The phrase the thin black line means having the ability to balance two different ideas or groups. The phrase the thin black line is an idiom.
A thin skin; a pellicle; a membranous covering, causing opacity; hence, any thin, slight covering., A slender thread, as that of a cobweb., To cover with a thin skin or pellicle.
There is not an exact meaning for thin blood but some drugs are called "blood thinners" as they act as anticoagulants. These slow down the clotting time.
"To be" is not an idiom - it's a verb.
Pest is not an idiom. It's a word.
The idiom "apple shiner" means the teacher's pet.
The meaning of the idiom in the pink of health means being in good health.
Skin and bones?
The idiom, 'jump out of your skin,' was first seen in England in the 1800s. It refers to a person being so scared that they 'jump out of their skin,' by dying and becoming a ghost.