"Scratch someone's back" means to give someone a favor or help them out with the expectation that they will return the favor in the future.
It implies a mutual benefit in relationships or transactions.
Idiom has separate meaning of its own
The idiom "stab someone in the back" means to betray someone who trusted you or to harm them in a way that is unexpected and hurtful
Nervous system is effected by the shortage of 1 Oxygen 2 Sulphur 3 Carbon 4 Sodium.
As you so, so shall you reap is a proverb which means جیسا کروگے ویسا بھروگے
Under the weather means بیمار
e.g. He is under the weather today.
At one's wits end means ایسی صورتحال میں ہونا کہ جب انسان کو پتہ ہی نہ چلے کہ اب کیا کیا جائے
AGM 08-01-2023
On the score of → on the ground of (کسی وجہ سے، کسی بنیاد پر)
its real meaning is to hide ones talent under the bushel