all of a sudden, it poured
- đang đi chơi, bất đồ trời đổ mưa: as he was going for a walk, suddenly it started pouring
- trời tối như bưng: it is as dark as if one's eyes were covered with a bandage, it is pitch-dark
- trời mưa: it 's rainingit's a fine for young ducks
