I don't understand "S/C problem at GRE®"

[Gq5974]

Although recently _____, her reputation need no _____; her contribution to astronomy has been awarded by ~~~.

Answer : embattled, burnishing

But, I don't know what means 'burnishing'
I think that for example, "her reputation needs no [u]contention etc.[/u]"
burnishing means???
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VERITAS LUXMEA !!

[Sleepy_Sentinel]

sorry if this is a little late...burnishing means polishing

p.s. would sincerely appreciate it if you could reply to my post titled 'weightage of GRE in admission process'