Simple past tense and past participle of limber.(verb)
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Use "limbered" in a sentence
"Even as coalition forces limbered up for their second, immensely bloody assault on Fallujah in 2004, George Bush was co-opting the Iraqi national side as a symbol of hope for his re-election campaign adverts, underscoring that football is not just more important than life and death from white phosphorus, but far more "symbolic" than things such as water and electricity."
"Bill Totts did not slouch, but somehow his whole form limbered up and became graceful."
"I've limbered my jints too long in the land to git caught nappin '."