[f. FLASH a.3 + HOUSE.] A house frequented by ‘flash’ persons (see FLASH a.3 5); a resort of thieves; also, a brothel.

1

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.

2

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.

3