[f. BACK a. and sb.] A small and usually private shop behind the main one; a secret place of business.
1583. Golding, Calvin on Deut., cxxii. 751. When we keepe such Backeshops, it is a token that our heart is not rid quite and cleane.
1682. N. O., Boileaus Lutrin, III. 47. Here a Bookseller in his back-shop slept.