noun, masculine/pas.paʁ.tu/plural: passe-partouts
master key; matte (decorative border around a picture); type of brush; ellipsis of scie passe-partout; two-man crosscut saw
“Je visitai deux ou trois amis, puis je revins à la maison, où je rentrai, grâce à un passe-partout.” — I visited two or three friends, then I came back to the house, which I re-entered thanks to a skeleton key.
Synonyms: passe, rossignol, passant