int $term, int $tt_id, WP_Term $deleted_term, array $object_ids )
Fires after a term in a specific taxonomy is deleted.
The dynamic portion of the hook name,
$taxonomy, refers to the specific taxonomy the term belonged to.
Possible hook names include:
(int) Term ID.
(int) Term taxonomy ID.
(WP_Term) Copy of the already-deleted term.
(array) List of term object IDs.