adjective
also back·stair ˈ ̷ ̷| ̷ ̷
Etymology: back stairs, n.
1. : characterized by a quality and air of secrecy and intrigue
backstairs deals
backstairs gossip
: furtive , devious
his low backstairs cunning — A.L.Guérard
2. : having a sordid or scandalous character
backstairs intimacies — A.L.Kroeber
cheap backstairs fiction — E.A.Weeks