"Cool it!"
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cool it</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 relax that I've seen before include "Unbend" , "Make (rule) less strict" , "Hang loose" , "Moderate" , "Loosen up, slow down" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cool it</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for calm down that I've seen before include "Become less agitated" , "still" , "Don't get so upset!" , "Cool it - don't be a mad clown" , "Become more tranquil" .)
(Other definitions for smithsonian that I've seen before include "Washington museum institution" , "Washington research institution" .)