n.1 Brit. a railway at a fair etc., in which the train's ascents are effected by the momentum of its previous descents.
2 (often attrib.) a railway or road with alternate sharp ascents and descents.
n.1 Brit. a railway at a fair etc., in which the train's ascents are effected by the momentum of its previous descents.
2 (often attrib.) a railway or road with alternate sharp ascents and descents.
Oxford English vocab. Оксфордский английский словарь. 2012