Can-worms is a phrase that refers to the act of stirring up controversy or causing trouble by revealing hidden information or secrets. Synonyms for this phrase include "open a can of worms," "open Pandora's box," "stir the pot," "rock the boat," "kick up a hornet's nest," and "light a fire under." These idioms all share the same meaning of starting something that may eventually lead to chaos or conflict. They are often used to caution against bringing up a sensitive topic or to describe the aftermath of someone who has caused disruption by sharing sensitive information. Whether intentional or unintentional, opening a can of worms can have significant consequences, and it is wise to approach the situation with caution.