am ‧ mu ‧ ni ‧ tion /ˌæmjəˈnɪʃ ə n, ˌæmjʊˈnɪʃ ə n/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Origin: Early French amunition , from munition ; ⇨ ↑ munitions ]
1 . bullets, shells (↑ shell ) etc that are fired from guns
2 . information that you can use to criticize someone or win an argument against them
give somebody ammunition/provide somebody with ammunition
His mistakes provided political opponents with even more ammunition.