booster bag n. a bag, sack, pouch, purse, or box used by a shoplifter to conceal or disguise merchandise. Etymological Note: to boost ‘to steal; to shoplift’ + bag (source: Double-Tongued Dictionary)
Further reading
You know the expression fly in the ointment: It’s that glaring typo on an impressive resume or that first scratch on a brand-new car—the one little flaw that spoils it all. This phrase goes all the way back to the biblical Book of Ecclesiastes! And...
The phrase a fly in the ointment means “a small thing that ruins something larger.” The phrase goes all the way back to a passage in Ecclesiastes: “Dead flies cause the ointment of the apothecary to send forth a stinking savor.” Here the word...