Do somebody/something a power/world of good British old-fashioned informal
To have a positive effect on someone or something
The fact that you've come all the way down here to pick me up does me a power of good.
I think taking a walk right now would do you a world of good.
To become better
People's arms linked together to show the intimacy between two people.
To not wonder, worry or be surprised about what is not predicted will happen in life because anything could happen
The verb "do" should be conjugated according to its tense.
1.Someone viewed with contempt
2. Very bad
1. He dropped out of college and became a crumb bum.
2. The food here is crumb bum! I will never come back to this restaurant once again.