Difference between Wear Down and Wear Out

WEAR DOWN vs WEAR OUT: VERB

To punish by spanking.
Of a shirt, not tucked into the pants; worn in a casual manner.
Of apparel, displayed in public.
To become exhausted, tired, fatigued, or weary, as by continued strain or exertion.
To exhaust; to cause or contribute to another's exhaustion, fatigue, or weariness, as by continued strain or exertion.
To deteriorate or become unusable or ineffective due to continued use, exposure, or strain.
To cause (something) to become damaged, useless, or ineffective through continued use, especially hard, heavy, or careless use.
Exhaust or tire through overuse or great strain or stress
Go to pieces
Deteriorate through use or stress

Dilapidate, Exantlate, Foreworn, Forworn, Wear away, Fag, Wear out, Tire out, Wear upon, Jade, Weary, Tire, Fatigue, Outwear, Wear

Fag, Wear thin, Wear down, Tire out, Wear off, Fall apart, Wear upon, Jade, Bust, Fatigue, Weary, Tire, Break, Outwear, Wear

Bedraggle, Dilapidate, Exantlate, Foreworn, Forworn, Wear away, Fag, Wear out, Tire out, Jade, Weary, Tire, Fatigue, Outwear, Wear

Forworn, Exantlate, Foreworn, Fag, Wear thin, Wear down, Tire out, Jade, Bust, Fatigue, Weary, Tire, Break, Outwear, Wear

These both wear down over time, mostly in supercruise.
The cause of DDD is when discs wear down.
But strain had begun to wear down the marriage.
The patterns are permanent, but can wear down.
Machines wear down and need to be replaced.
The bars wear down quickly, but nothing more.
This will wear down the place pretty quickly.
As for other things that wear down, the spider can lose some control as is wears down.
That is why you need to make a replacement to the wear down wear parts.
This shape allows for the most even wear as you wear down the wheel.

When your old clothes wear out, or go out of style, most people simply donate them to a good cause.
Wear out refers to the removal of the pattern and colour from an Amtico floor, caused by the removal of the protective wear layer.
As these units break or wear out, they will have to be permanently taken out of service.
Paper dartboards wear out quickly, which can cause the darts to fall out.
Brushes eventually wear out and require replacement, and the commutator itself is subject to wear and maintenance.
Rubber seals do wear out, regardless of whether it was due to some outside influence or normal wear and tear.
However, I only wear them two days a week and in a year I will wear the sole down and wear out the sides.
Wear and tear however, includes parts that wear out over time from normal use.
Eventually, they'll wear out, and then I can wear them to bed.
Your tires wear out over time, and you want to be sure that they wear out evenly.