Difference between Slow Down and Standstill

SLOW DOWN vs STANDSTILL: NOUN

Complete immobility; halt
A standing without moving forward or backward; a stop; a state of rest.
The state of standing still; a state of immobility.
A halt; a pause; a stop, especially in consequence of obstruction, exhaustion, or perplexity.
Complete cessation of activity or progress.
A situation in which no progress can be made or no advancement is possible
An interruption of normal activity

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

Stop, Moratorium, Blockade, Freeze, Adjournment, Collapse, Gridlock, Shutdown, Stalling, Stand, Halt, Tie up, Deadlock, Impasse, Stalemate

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

Truce, Paralysis, Stagnation, Interruption, Stoppage, Stop, Blockade, Freeze, Adjournment, Gridlock, Shutdown, Stalling, Stand, Halt, Tie up

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.

Congress is at a standstill because of Watergate.
German government the country came to a standstill.
Westminster Bridge bringing the traffic to a standstill.
Still, standstill budgets rarely have a neutral impact.
Business in burlap came to a virtual standstill.
English and Dutch alike, came to a standstill.
Without electricity, society would come to a standstill.
As expected, recent figures at this particular business showed a standstill financial performance and this has been reflected in a standstill share-price performance.
Second Lien Standstill Period, the Third Lien First Standstill Period and the Third Lien Second Standstill Period, as applicable.
Seeking amendments or waivers from the standstill or challenging validity of the standstill.