Imprison or confine (4,2)
I believe the answer is:
lock up
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">imprison</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">confine</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that lock up is a more specific form of the action confine)</span><br/ ><br/ ></span>
(Other definitions for lock up that I've seen before include "Jail; type of garage" , "Secure garage" , "Immure" , "Shop without living quarters" , "Cell for prisoners" .)