King James Bible Dictionary

A morsel of bread (John 13:26; comp. Ruth 2:14). Our Lord took a piece of unleavened bread, and dipping it into the broth of bitter herbs at the Paschal meal, gave it to Judas. (Comp. Ruth 2:14.)

In eastern lands where our table utensils are unknown, the meat, with the broth, is brought upon the table in a large dish, and is eaten usually by means of pieces of bread clipped into the common dish. The bread so dipped is called. "It was such a piece of bread a sop dipped in broth that Jesus gave to Judas, (John 13:26) and again, in Matthew 26:23 It is said "he that dippeth his hand with me in the dish," i.e. to make a sop by dipping a piece of bread into the central dish.

SOP, noun

1. Anything steeped or dipped and softened in liquor, but chiefly something thus dipped in broth or liquid food, and intended to be eaten. Sops in win, quantity for quantity, inebriate more than win itself.

2. Any thing given to pacify; so called from the sop given to Cerberus, in mythology. Hence the phrase, to give a sop to Cerberus.