Difference between Slow Down and Let Alone

SLOW DOWN vs LET ALONE: VERB

Not to mention, as well as; used after one item, to introduce a further item which is entailed by the first.
Much less; to say nothing of; used after one negative clause to introduce another, usually broader and more important clause, whose negation is implied by the negation of the first.

Back off, Speed limit, Speed up, Slow up, Unlax, Slack, Slacken, Unwind, Decompress, Unbend, Decelerate, Relax, Loosen up, Slow, Retard

Stay off, Go back, Catch up, Back off, Speed up, Slow up, Slack, Slacken, Decompress, Unbend, Decelerate, Relax, Loosen up, Slow, Retard

Slow down and shift down to a speed that you can controlwithout using the brakes hard.
Time Stop: Slow down the passage of time so slow it eventually freezes, stunning all enemies in the area.
It is likely that traffic will slow down, or even stop, further down the road.
Fortunately, you can combat the risk of bloat by helping your Labrador slow down their rate of eating with a slow feeder.
OTR and yes things do slow down a bit after the holidays but at least when I was there they were really never slow.
Slow debuff, which can greatly slow down a player, even if just for a second.
Does it force you to sit down, lie down, slow down?
The problem is so severe that it will even slow down my internet feed and slow down other excel files I have open.
They gradually slow down, forcing pursued vehicle to slow down by allowing no outlet.
When i slow down to turn a corner, or slow down for a traffic light, going at a slow speed from approx.

English and Spanish, let alone any other languages.
It did not even let me know who she was, let alone tell me if she missed me.
The act of capture alone, let alone the sustained and chronic stress that he is subjected to, could easily be responsible for that.
There was no way I would have been able to greet every single guest, let alone let them into my home at random times.
Note that an anonymous tip alone is not enough to meet the reasonable suspicion standard, let alone the probable cause standard.
The sheer size of the burrito alone has us speechless at that feat, let alone the spice level.
Let alone be let down by a hospital that prides itself of its high standards.
Contracts between xml, let alone alone serdes that uses them up with kafka to and the cloud.
Flight alone, like concealing a crime, should provide an inference of specific intent, let alone culpable negligence.
Easily one of the weakest features in any class, let alone Warlock, and let alone again for grapplers.