Enjoin, what?

Some English words have two opposite meanings depending on another word associated with it. Failing to use the correct pair will result in ambiguity. And this problem has crept into some legal literature including even Supreme Court decisions.

Take the word enjoin, for example. This is what Meriam Webster online dictionary says:

• : to direct or order (someone) to do something: to prevent (someone) from doing something; especially : to give a legal order preventing (someone) from doing something

Two opposing meanings for the same word.

So what did Sundiang and Aquino mean here on page 392 of their book Reviewer on Commercial Law, 2014 Edition?

Was the applicant prohibiting or urging the payment?

To prevent any ambiguity here's the correct pairing of words according to Black's Law Dictionary:

As for the SC decision you should see the case referred to by the book.