The prison - the watch (marginal reference).
Piece - literally, a circle, i. e., a round cake.
The bakers’ street - It is usual in oriental towns for each trade to have a special place set apart for it. Compare Acts 10:6.
Related Commentaries of Jeremiah 37:21
Jeremiah 37:21
21 Then Zedekiah the king commanded that they should commit Jeremiah into the court of the prison, and that they should give him daily a piece of bread out of the bakers' street, until all the bread in the city were spent. Thus Jeremiah remained in the court of the prison.