Shock, stagger (4)
I believe the answer is:
stun
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">shock</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(both can mean to surprise)</span><br/ ><br/ >'<span class="explanation-format__original">stagger</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(both can mean to shock)</span><br/ ><br/ ></span>
(Other definitions for stun that I've seen before include "Daze, overwhelm" , "Daze, knock senseless" , "Knock unconscious" , "Daze or bewilder" , "Make dazed or numb" .)