noun
creep (automatic transmission); idle creep
Refers to the tendency of an automatic-transmission vehicle to move slowly forward when the engine is idling and the brake is not applied.
オートマ車はブレーキを離すとクリープ現象でゆっくり進む。
An automatic car moves forward slowly due to creep when you release the brake.
From English 'creep' plus 現象 (phenomenon).