Definition of bicycle shed in English:

bicycle shed

noun

  • A shed or building for storing bicycles when not in use, especially at a school or workplace; "behind the bicycle shed(s)", used with reference to this as a place of seclusion at a school in which pupils typically pursue prohibited activities such as smoking, fighting, etc.

    Related bike shed

Origin

Late 19th century; earliest use found in Bell's Life in London and Sporting Chronicle.