The American biscuit is closest to a scone — specifically a plain, savoury, unsweetened one. Same family: a quick bread raised chemically rather than with yeast, made with fat cut into flour, baked in a hot oven, meant to be eaten warm and fresh.
The differences are real but small. The American version is usually flakier and layered, made with buttermilk, and never sweet. A British scone is often slightly sweet, and if it has fruit in it the resemblance disappears entirely.
And the gravy is not brown roast gravy. It is a white sauce — a roux made with the fat from cooked sausage, with milk and pepper, and usually pieces of the sausage in it. In British terms it is much nearer a savoury white sauce or a peppery béchamel than anything on a Sunday roast.
So the accurate translation is roughly: plain savoury scones under a peppery sausage white sauce. That is a dish a British person can picture and it sounds reasonable, which the literal version does not.