Come down with (3)

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">come down with</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for get that I've seen before include "See 18" , "Procure or secure" , "Acquire" , "Understand" , "Fetch or obtain" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">come down with</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 catch that I've seen before include "secure" , "Grab in mid-air" , "Getting round" , "Accurately detect" , "fellow hooked for matrimony?" .)