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Region: US | Usage example: Bringing that topic up opened a can of worms.

Open a can of worms

Meaning

Start something that becomes complicated.

Usage

Used for unintended consequences.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Fishing analogy where opening a bait can leads to chaos.

Popularized in American speech after World War II.

Related Idioms

Keep your ears open

Be attentive and listen for useful information.

Open the floodgates

Unleash a large, often overwhelming amount.

Keep your options open

Avoid committing to one plan in case other opportunities arise.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.