with a clatter; loudly; flinging open
Describes the sound or action of something opening or moving noisily, often with a sliding or banging motion.
He flung the door open with a clatter and came in.
completely; dramatically; suddenly
Indicates a sudden, drastic change in state, appearance, or situation.
When I changed my hairstyle, my impression changed completely.
He flung the door open with a clatter and came into the room.
His attitude changed completely all of a sudden.
After redecorating, the room's atmosphere changed completely.