heavy lift

noun2

1. •
   The handling and installation (on means of freight transport) of heavy items that are indivisible.
2. •
   (figurative) A requirement that requires a lot of work to satisfy; high bar, tall order.

   • When a federal statute applies on its face to both private and state actors, a commandeering argument is a heavy lift—and petitioners have not pulled it off. — 2023