1. showing no activity, progress, or growth; remaining at a constant low level
Usage: informal
2. showing a flat line on a heart monitor, indicating cardiac arrest or death
Usage: medical

1. the state of showing no activity, progress, or growth
Usage: informal

Examples

• The company’s sales have been flatlining for months.
• His career seems to be flatlining after that scandal.
• The patient was flatlining when the paramedics arrived.
• The economy is flatlining despite government intervention.
• After the initial success, the project started flatlining.
• The stock price has been flatlining all week.
• The flatlining of productivity concerns management.