Arms malfunction (7)
I believe the answer is:
misfire
(Other definitions for misfire that I've seen before include "Fail to go off properly" , "failure to make a report?" , "(Of a gun) fail to operate correctly" , "Fail to detonate" .)
I believe the answer is:
misfire
(Other definitions for misfire that I've seen before include "Fail to go off properly" , "failure to make a report?" , "(Of a gun) fail to operate correctly" , "Fail to detonate" .)