the cat's out of the bag

bag of bones

A skinny, malnourished person or animal.

bag of tricks

A set of skills, techniques, items of information, or other resources used to help achieve professional or personal goals.

brown bag

A short presentation or seminar on a given subject, especially one given at lunchtime.

cat's cradle

Any complicated structure that appears to be without purpose.

cat's meow

A self-satisfied person.

give someone the bag

To disappoint (someone).

let the cat out of the bag

To disclose a secret; to let a secret be known, often inadvertently.

look what the cat's dragged in

Used as an ironic acknowledgement of someone's arrival, either jocularly or to imply that they are unwelcome or disagreeable in some way.