1ebb 
/ˈɛb/ noun
plural ebbs /ˈɛb/ noun [count] 1 : the time when the tide flows out from the land 2 : a low point or condition : a condition of weakness, failure, etc.
▪ Morale seems to have reached its lowest ebb. — often used after at ▪ Our spirits were at a low ebb. [=were very low] ▪ His fortunes were at their lowest ebb.
▪ Morale seems to have reached its lowest ebb. — often used after at ▪ Our spirits were at a low ebb. [=were very low] ▪ His fortunes were at their lowest ebb.
ebb and flow
— used to describe something that changes in a regular and repeated way ▪ the ebb and flow of fashion ▪ the ebb and flow of human history
