Get sb.’s Nose to the Grindstone努力干活,毫不停歇

J：Why don’t you have your friends join us?

S：Why, sure. Hey, why don’t you kids drive down with us, huh?

G：Oh, I’m afraid I couldn’t get away, Sam.

S：Still got the nose to the old grindstone, eh?

Jane, I offered to let George in on the ground floor in plastics and he turned me down cold.

G：Oh, now don’t rub it in.

S：Ah, ah, I’m not rubbing it in.