Difference between Slow Down and Loosen Up

SLOW DOWN vs LOOSEN UP: VERB

To relax, act less seriously.
To become loose; to loosen
Cause to feel relaxed
Make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
Cause to become unblocked
Become less tense, rest, or take one's ease
Become less tense, less formal, or less restrained, and assume a friendlier manner

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

Fatten up, Eke out, Morning sickness, Sniff out, Unstuff, Unstrain, Unlax, Make relaxed, Limber up, Decompress, Unbend, Unwind, Relax, Slow down, Warm up

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

Wipe away, Make headway, Body odor, Snuff out, Sit tight, Fatten up, Eke out, Morning sickness, Sniff out, Limber up, Decompress, Unbend, Relax, Slow down, Warm 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.

Your muscles really loosen up in heated water.
Great reminder to loosen up and have fun!
Do easy stretches to loosen up your muscles.
The straps can loosen up as you drive.
NEVER had one loosen up since I changed.
Turn the speakers up a little louder than you normally would will help loosen up the material.
Things are stating to loosen up as state parks and boat launches open up.
In sum, my internal workplace advice is: open up, loosen up, listen up, speak up, and don't work weekends on anything you don't enjoy.
However, they tend to loosen up after washing up for a few times.
Should I dig up and loosen up the rootball?