To know your lines
Meaning
To be thoroughly prepared and fully aware of what you need to say or do in a particular situation.
Origin
The phrase 'to know your lines' originates directly from the world of theatre. In a play, an actor's 'lines' are the dialogue they must memorize and deliver flawlessly. A performer who doesn't know their lines risks halting the entire production, disrupting the flow, and breaking the audience's immersion. This critical requirement for actors to be impeccably prepared with their script naturally transcended the stage. It evolved into a common idiom, powerfully conveying the importance of being fully ready, having one's facts straight, or knowing precisely what to say or do in any given scenario, from a crucial negotiation to a formal speech.
Examples
- Before the big presentation, it's crucial for everyone to know their lines so we can deliver a smooth and confident pitch.
- The new manager quickly learned that in a crisis, you really need to know your lines if you want to reassure the team and prevent panic.