
Let alone
Increasing Improbability
Use 'let alone' to highlight a progression from something improbable to even more so.

He's not ready to run a 5k, let alone a marathon.
Contrast Stressed
'Let alone' emphasizes contrast, not a comparison for similarities.

She won't eat vegetables, let alone try exotic foods.
Stark Contrast
The phrase often points to extreme differences between two elements.

They struggle to boil water, let alone cook a three-course meal.
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