Crossword Genius

They're up in arms (5)

Ross

I believe the answer is:

ulnae

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">they're up in arms</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for ulnae that I've seen before include "Army parts" , "Thin bones in upper arms" , "parts of limb" .)

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