declare war on

declare war on

Also, declare war against. Announce one's intent to suppress or eradicate something or someone. For example, The police have declared war on drug dealing in the neighborhood, or Several gangs have declared war against each other. This usage transfers the literal sense of the term, "to state formally one's intention to carry on hostilities against another power," to a somewhat smaller scale.
See also: declare, on, war
References in periodicals archive ?
November 5: Britain and France declare war on the Ottoman Empire.
Bush did not declare war on Al Qaeda or the Taliban; he declared war on terrorism, which will be with us in one form or another for the foreseeable future.
A better analogy for protectionism is domestic producers and the government forming an alliance to declare war on the wallets of domestic consumers.