To hide or conceal.
To make an action as if doing one thing, but actually doing another, for example to trick an opponent; to feint.
To make a false show or pretence of; to counterfeit or simulate.
To imagine; to invent; to pretend to do something.
To inadvertently reveal any secret, particularly a secret that puts one at an advantage or disadvantage.
In card playing, to accidentally reveal one's cards or hand.