o ‧ ver ‧ kill /ˈəʊvəkɪl $ ˈoʊvər-/ BrE AmE noun [uncountable]
[ Word Family: noun : ↑ kill , ↑ overkill , ↑ killer , ↑ killing ; verb : ↑ kill ; adjective : ↑ killer ]
more of something than is necessary or desirable:
More television coverage of the election would be overkill.