A room, hall, or enclosed space that is distinguished by blue decoration, upholstery, or lighting and is referred to by that characteristic.
2.
Global Englishformal
A legislative or deliberative chamber informally described by a blue color scheme or by association with a political party or faction represented by the color blue (used when applicable in particular political contexts).
3.
Global Englishneutral
A specific chamber or named room within a building that is commonly identified as the 'Blue Chamber'.
Examples:
EN: Don't forget the blue chamber.
ES: ¿Sí? Por favor, no olvide arreglar el cuarto azul.