flatline

verb
1
to be at a low level and fail to improve or increase
ثابت ماندن, بدون پیشرفت بودن, بدون تغییر ماندن, در سطح پایین ماندن
2
to die; to become clinically dead even if you later recover
از دنیا رفتن, فوت کردن, مرگ بالینی
I flatlined twice and was on life support for several days.