Calling Linguists (Again)

[Rival]

Stand Down.... is in very common usage especially in the forces. as is stand easy, and stand at ease...or stand to attention. All have very specific meanings. and responses.
As I said previously I do not thinks the redundancies have always been redundant , but we have lost the distinctions in meaning. I suspect that the word to sit did not mean as sit, as in a chair. ... People certainly sat but there were few chairs. and those were reserved for the nobs. If you ask a child to sit up, that is quite different to saying sit down as he would already be sitting.

Perhaps to sit down meant to sit down on a bench with the underlings, and sit Up meant sit up on a chair with the lords. by now it is lost in the mists of time... but once how and where you sat was very important... it is even mentioned in the Bible.

Maybe a better illustration would be

"Rise up"

Well, given the meaning of 'rise'...

 

[Terrywoodenpic]

Maybe a better illustration would be

"Rise up"

Well, given the meaning of 'rise'...

Rise up seems to be a combination with a special meaning.
Though in a formal meeting one is often asked to rise.
Rise up seems to have few uses. Perhaps the most common one would be the meaning to rise up against something. it certainly has the implication of, to get up off your bum and do something.

 

[Iti oj]

I think the op is lacking in subtlety and more importantly context.