[f. FLASH a.3 + HOUSE.] A house frequented by flash persons (see FLASH a.3 5); a resort of thieves; also, a brothel.
1816. Rep. Committee on Police Metrop., 209. Is the flash-house an assistance to the officer? Certainly the flash-house can do the officer no harm, if he does not make harm of it.
1828. Macaulay, Ess., Hallam (1843), I. 192. The excesses of that age remind us of the humours of a gang of footpads, revelling with their favourite beauties at a flash-house.