WordPress at a glance
action is not described

delete_comment action-hook . WP 1.2.0

Fires immediately before a comment is deleted from the database.

Usage

add_action( 'delete_comment', 'action_function_name_5847', 10, 2 );
function action_function_name_5847( $comment_id, $comment ){
	// action...
}
$comment_id(int)
The comment ID.
$comment(WP_Comment)
The comment to be deleted.

Changelog

Since 1.2.0 Introduced.
Since 4.9.0 Added the $comment parameter.

Where the hook is called

wp_delete_comment()
delete_comment
wp-includes/comment.php 1379
do_action( 'delete_comment', $comment->comment_ID, $comment );

Where the hook is used (in WP core)

Usage not found!