That's as firm as the Rock of Cashel—as firm as the hob of hell.
hob or nob is explained by him to mean "Will you have a glass of wine or not?"
First the players pitch from the hob to the Scop, and the one who gets nearest goes first.
The kettle chooses to sit still on the hob; the eagle to recline on the air.
The coffee-pot was puffing like a little steam-engine on the hob, and Jantje was cutting the new bread into good thick slices.
The fire was burning brightly, and the kettle was singing on the hob.
If he knocks off any of the Cots and Twisses nearer to the players than the hob is, he claims them.
His tea was ready for him on the hob, and they all tried who should help him to it most.
Now, whatever error the hob thread receives from hardening it transfers to the chaser it cuts.
“Come, doctor, let you and I hob and nob,” said the first-lieutenant.
"side of fireplace," 1670s, alteration of hubbe (1510s), of unknown origin, perhaps somehow related to the first element in hobnail.