"to uphold and to enforce" 19:20 Jul 5, 2018
I cannot post an answer so can only do my best here.
This form of words means both "to uphold and to enforce".
A court will "uphold" the decision of a lower court so to that extent, this is the meaning as it applies when addressing the Procureurs. That is something judges, courts, Procureurs can do.
When it comes to bailiffs and other officers of the court, then the expression adopts the meaning as it applies to them. Thus, the court addresses any bailiffs who may receive instructions to enforce the judgment or ruling. "Enforcement" can also apply in addressing judges when an someone takes out eforcement proceedings.
For example, if you get a judgment debt in your favour but the debtor fails to pay, you can wave the judgment under the nose of a bailiff who has the authority to do a whole host of things to try and recover the debt. If that fails, then you can return to court and appy for enforcement proceedings. In the first instance, the phrase addresses bailiffs, in the second, it is being addressed to the courts (judges, proc, etc).
I suggest you use both as in my title as your expression as psoted is no doubt incomplete, the full version applying to off. of court + proc. | 
