A lock is provided especially for a door (2) or flap of a motor vehicle. Said lock has a lock housing (3) and a locking mechanism having a rotary latch (4) and a pawl, wherein the rotary latch (4) is arranged pivotably about an axis (22) and interacts with a locking bow (9), which is assigned to the bodywork (8), during the opening and closing of the door (2). At least one spring plate (15) which is oriented substantially parallel to the rotary latch (4) and surrounds the locking bow (9) in the locking position of the lock is arranged in the lock inlet region of the lock housing (3).