Difference between Loosen Up and Fend Off

LOOSEN UP vs FEND OFF: 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

To ward off; to drive (something) away; to turn away; to defend against; to repel with force or effort.
Prevent the occurrence of; prevent from happening

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

Crack down, Get rid of, Eke out, Take aim, Clamp down, Shrug off, Lash out, Debar, Obviate, Deflect, Avert, Avoid, Stave off, Head off, Ward off

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

Gain ground, Make headway, Crack down, Get rid of, Eke out, Take aim, Clamp down, Shrug off, Lash out, Debar, Obviate, Deflect, Avert, Avoid, Stave off

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?

These heavily armored infantrymen can fend off a Sword blow.
Muslim vote and fend off attacks on his leadership.
But it will help fend off his primary challenger.
Witch Doctor fend off the powerful sting of Skorpios?
Soviet democracy, to fend off Russia in the east.
STATE RESISTANCE PREPARATIONS HELP FEND OFF BIGGER THREATS?
It helps your body fend off the virus.
Learn how to fend off foxtails and fleas.
Rambler, rover, stroller, pel, turn aside, fend off, keep off landloper, nomad, traveller, vagrant.
This fact alone shows that there are causes with the power to fend off death, even if not to fend it off permanently.