What does semi-engagement mean in a manual transmission car?

[Don]

In a manual transmission car, semi-engagement refers to the intermediate transition zone where the clutch is neither fully engaged nor fully disengaged. In practical use, when the clutch is slowly released, the vehicle may shake or move forward slightly, indicating that it is in a semi-engaged state. This state, combined with the throttle, can be used to start the car or shift gears. Below are some details about semi-engagement: 1. When the engine is without load, the sound is relatively relaxed. If a load is added, meaning the clutch is lifted to the point where power transmission begins, the engine sound becomes deeper, especially noticeable when the car is under heavy load. 2. When the clutch is lifted to the semi-engagement position, the car will transition from a stationary state to motion with a noticeable shaking sensation. If you lightly place your hands on the steering wheel, you can easily feel this shaking. At this point, the clutch is precisely in the semi-engaged state.