Pass-or-correct bid
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In the card game bridge a pass-or-correct bid (or convertible bid), is a non-forcing bid that asks the partner to pass or bid differently based on her/his holding. Pass-or-correct bids are generally used as responses to multiway bids.
A typical example is the 2♠ response on a multi 2 diamonds opening that asks the partner to pass with a weak hand with long spades or to bid three hearts with a weak hand and long hearts. This 2♠ bid implies length in hearts and denies length in spades.
Pass-or-correct bids that are made in a suit you don't hold when the length in one of two suits has been shown by the partner's bid are also referred to as paradox responses.