Clutch/Clutch Hydraulics Related

Clutch shudder - a repeated jerking sensation caused by the slipping and grabbing of the clutch disc when releasing clutch/launching the vehicle.
High pedal effort - when an unusual amount of force is required to depress the clutch pedal.
Pedal vibration - a vibration that is transmitted through the clutch pedal.
Spongy clutch - spongy feel when depressing clutch and usually an indication of air in the hydraulic system.
Squeaky clutch - when a squeak is generated while depressing or releasing the clutch pedal.
Inoperative clutch - non-functional clutch.
High engage point - long clutch pedal travel during pedal release before the clutch disc engages.