0 the condition of being at a very low level and not increasing:
1 at a very low level and not increasing:
This flatlining of temperature may continue for another 10 years.
The flatlining of the economy at the turn of the century brought extreme poverty in some areas.
They are concerned about their son's flatlining test scores.
His aim will be to reanimate the flatlining economy with a fiscal stimulus package.
She is attempting to revive her flatlining career.
It is the story of a flatlining relationship.