level off/out phrasal verb ( see also ↑ level )
1 . to stop going up or down and continue at the same height:
After climbing steeply, the path levelled off.
The plane levelled out at 30,000 feet.
2 . to stop rising or falling and become steady:
Inflation has begun to level off.
3 . level something ↔ off/out to make something flat and smooth