On a whim phrase
Because of a sudden strong wish to do something or have something.
I understand why you got fed up with your job, but don't just leave it on a whim.
We went on that picnic on a whim, but it turned out to be the greatest picnic we've ever had.
John is such a spendthrift. He told me he didn't need that bike, but he had just bought it on a whim.
This phrase was first recorded 1690s.
Being very powerful
I always thought that their marriage was steady as a rock..