I was wondering if there is any difference between the idiom "pull someone's leg" and the phrasal verb "put somebody on".
The Cambridge Dictionary says to put someone on means:
To try to persuade someone that something is true when it is not, usually as a joke.
Example: She said she was planning to give her house to a charity for the homeless but I thought she was putting me on.
Also as it says, to pull one's leg means:
To tell someone something that is not true as a way of joking with the person.
Example: Stop pulling my leg – you didn’t have lunch with Bono!
As you can see within the descriptions and examples, they both can be swapped for each provided example and seems that they are interchangeable.
Please kindly enlighten me.