falsecard means A card played in order to deceive an opponent as to one's true holding. Lexicurio rates it Sui generis — a strength score of 93 out of 100.
Etymology
From false + card.
noun
- A card played in order to deceive an opponent as to one's true holding
verb
- To play a falsecard“East returned the diamond eight, the higher of his two remaining cards, on which declarer falsecarded with his ten.”