prove a check on the administration

Humble   Sun Jul 22, 2007 7:28 pm GMT

Could you please explain the part after the comma? I don’t quite understand it.
Last year he [Chief Justice Iftikhar Muhammed Chaudhry] blocked a government bid to sell the majority of the state-owned Pakistan Steel Mills to a private consortium, a blow that proved a rare and embarrassing check on the administration.

Ant_222   Sun Jul 22, 2007 8:30 pm GMT
proved = proved to be:

...a blow that turned to be a rare and embarrassing check on the administration.

Check on the administration = an act of keeping the administration from doing something.
Humble   Wed Jul 25, 2007 6:12 am GMT
I see - I just didn't know all the meanings of "check" - an elementary problem (shame on me). I've found in Collins now:
18) a break in progress; stoppage
19) a restraint or rebuff
20) a) a person or thing that restrains, halts, etc

Thank you, Ant.
Skippy   Wed Jul 25, 2007 4:51 pm GMT
In this case, a check would be a restraint on the powers of the administration.