Shoot through (7)
(Other definitions for decamp that I've seen before include "Mizzle" , "scarper!" , "Bolt" , "Fold up tent and depart" , "Fold up tents and depart" .)
(Other definitions for vamoose that I've seen before include "Clear off" , "Escape" , "vanish" , "Depart hurriedly" , "Beat it" .)