Meaning : Leave unchanged or undisturbed or refrain from taking.
Leave it as is.
Leave the young fawn alone.
Leave the flowers that you see in the park behind.
Meaning : Much less.
She can't boil potatoes, let alone cook a meal.
Synonyms : not to mention
Let alone ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Let alone ka matlab kya hota hai?