To hang over; to cover; to lie over; to overlap — to fall or hang on top of something.
黒い雲が山にかぶさってきた。
Dark clouds have moved in and are hanging over the mountain.
屋根に雪がかぶさって重くなっている。
Snow has piled onto the roof and it's getting heavy.
大きな葉が顔にかぶさって見えにくい。
A large leaf is hanging over my face and it's hard to see.
To fall on one's shoulders; to become someone's responsibility; to become a burden.
突然大きな仕事が彼の肩にかぶさった。
Suddenly a large job fell onto his shoulders.
借金の重みが家族全員にかぶさった。
The burden of the debt fell on the whole family.