WordPress at a glance
action is not described

deactivated_plugin action-hook . WP 2.9.0

Fires after a plugin is deactivated.

If a plugin is silently deactivated (such as during an update), this hook does not fire.

Usage

add_action( 'deactivated_plugin', 'action_function_name_8737', 10, 2 );
function action_function_name_8737( $plugin, $network_deactivating ){
	// action...
}
$plugin(string)
Path to the main plugin file from plugins directory.
$network_deactivating(true/false)
Whether the plugin is deactivated for all sites in the network. or just the current site. Multisite only.
Default: false

Where the hook is called

deactivate_plugins()
deactivated_plugin
wp-admin/includes/plugin.php 725
do_action( 'deactivated_plugin', $plugin, $network_deactivating );

Where the hook is used (in WP core)

Does not used.