noun
engine braking
Using the engine's resistance to slow down a vehicle instead of or in addition to the service brakes.
from English engine brake
長い下り坂ではエンジンブレーキを使うと安全です。
On long downhill slopes, using engine braking is safer.
エンジンブレーキの効きが弱いと感じ
If you feel the engine braking is weak, shift down one gear.