Yank (one's) chain American phrase
To make someone believe in something that is not true, usually in a lighthearted way.
He told me he thought I was beautiful, but I think he was yanking my chain.
I yanked his chain by telling him that there was a mouse in his room.
To maintain someone's attention or to keep them waiting in a state of uncertainty.
Very dishonest and deceptive
To deliberately hide one's true nature, intentions or purposes
The verb "yank" must be conjugated according to its tense.
The origin of this phrase is not clear.