From "Far From the Madding Crowd":
The fire before them wasted away. "Men," said Bathsheba, "you shall take a little refreshment after this extra work. Will you come to the house?"
"We could knock in a bit and a drop a good deal freer, Miss, if so be ye'd send it to Warren's Malthouse," replied the spokesman.
Is knock in a slang or colloquial phrasal verb for "eat, consume" (food and drink)?
I understand a bit and a drop to mean "food and drink".