The facts provided him with ammunition for his argument.
Her bad behaviour is giving him ammunition for a divorce.
An example of ammunition is when you know your little brother snuck in late and you threaten to tell on him if he doesn't make you breakfast.
A grenade is an example of ammunition.
Rocks were my only ammunition against the bear.
Origin of ammunition
- Obsolete French amunition from l'amunition the provisioning alteration of la munition from Old French from Latin mūnītiō mūnītiōn- fortification munition
From American Heritage Dictionary of the English Language, 5th Edition