■ noun
1》 an area or ridge of land that separates waters flowing to different rivers, basins, or seas.
2》 an event or period marking a turning point in a state of affairs.
3》 Brit. the time after which programmes that are regarded as unsuitable for children are broadcast on television.
Origin
C19: from water + shed in the sense 'ridge of high ground', suggested by Ger. Wasserscheide .