Let alone means 'not to mention'. Consider these examples. I don't have a car, let alone a bike.
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Let alone means 'not to mention'.
Consider these examples.
I don't have a car, let alone a bike.
Tom doesn't like Mary, let alone love her.
Jim couldn't walk, let alone run.
The underlying structure is not A, let alone B, where B is something better or more extreme than A.
The tone of the statement is strong and emph