wa·ter·shed 
/ˈwɑ:tɚˌʃɛd/ noun
plural wa·ter·sheds /ˈwɑ:tɚˌʃɛd/ noun [count] 1 : a time when an important change happens — usually singular ▪ The protests mark a watershed [=turning point] in the history of the country. — often used before another noun ▪ a watershed moment/year/event 2 a : a line of hills or mountains from which rivers drain : a ridge between two rivers
b chiefly US : the area of land that includes a particular river or lake and all the rivers, streams, etc., that flow into it
▪ the Connecticut River watershed 3 Brit : the time of day after which television programs not appropriate for children may be broadcast
▪ The show will not air until after the nine o'clock watershed.
b chiefly US : the area of land that includes a particular river or lake and all the rivers, streams, etc., that flow into it
▪ the Connecticut River watershed
▪ The show will not air until after the nine o'clock watershed.
