noun, verb, cat⋅ted, cat⋅ting.| 1. | a small domesticated carnivore, Felis domestica or F. catus, bred in a number of varieties. |
| 2. | any of several carnivores of the family Felidae, as the lion, tiger, leopard or jaguar, etc. |
| 3. | Slang.
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| 4. | a woman given to spiteful or malicious gossip. |
| 5. | the fur of the domestic cat. |
| 6. | a cat-o'-nine-tails. |
| 7. | Games.
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| 8. | a catboat. |
| 9. | a catamaran. |
| 10. | a catfish. |
| 11. | Nautical. a tackle used in hoisting an anchor to the cathead. |
| 12. | a double tripod having six legs but resting on only three no matter how it is set down, usually used before or over a fire. |
| 13. | Navy Informal. catapult (def. 2). |
| 14. | (in medieval warfare) a movable shelter for providing protection when approaching a fortification. |
| 15. | to flog with a cat-o'-nine-tails. |
| 16. | Nautical. to hoist (an anchor) and secure to a cathead. |
| 17. | British Slang. to vomit. |
| 18. | cat around, Slang.
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| 19. | bell the cat, to attempt something formidable or dangerous. |
| 20. | let the cat out of the bag, to divulge a secret, esp. inadvertently or carelessly: He let the cat out of the bag, and the surprise party wasn't a surprise after all. |

To disclose a secret: “The mayor's visit was to be kept strictly confidential, but someone must have let the cat out of the bag, because the airport was swarming with reporters.”
CAT abbr.
computerized axial tomography
let the cat out of the bag
Give away a secret, as in Mom let the cat out of the bag and told us Karen was engaged. This expression alludes to the dishonest practice of a merchant substituting a worthless cat for a valuable pig, which is discovered only when the buyer gets home and opens the bag. [Mid-1700s] Also see pig in a poke.