Emily Blunt is a life-saver … literally.

While visiting the Late Show With David Letterman on Tuesday, the 31-year-old shared how she saved Meryl Streep, her Into the Woods, from taking a nasty fall on set.

“I did save her life,” exclaimed Blunt, who was pregnant at the time of the accident. “We were rehearsing a scene where she’s playing the Witch and she’s supposed to jump on the table with a cape and everything. And I just saw this thing happen in slow motion. You know when you see something awful happen and it’s like the sound cuts out? Meryl Streep’s foot got caught in her cape and we just slowly stared to watch her topple head first towards the concrete floor.”

“Rob Marshall [director] and James Corden froze, didn’t move,” she marveled. “And the pregnant woman caught her…so she owes me, big time.”

The much-anticipated movie adaptation of Stephen Sondheim’s Tony Award-winning musical, which will be directed by Rob Marchall, is the second film on which the actresses have worked together. They teamed up in 2006’s The Devil Wears Prada and Blunt joked about their characters’ sparring matches in the film.

Emily Blunt: I Saved Meryl Streep's Life During #IntoTheWoods Shoot http://t.co/GOhMaHqLbK pic.twitter.com/mQ0xvwvQ5i

— Hollywood Reporter (@THR) November 26, 2014

“Yeah, she tormented me in that [Devil Wears Prada] and now she’s tormenting me in this movie,” said Blunt, who plays the baker’s wife in the film-version of the musical. “She’s the Witch that has cast a horrible spell on our house. So I just said this is it we couldn’t have any other dynamic now. You just have to hate me.”

Blunt told Letterman she thinks the roles need to be reversed in their next on-screen matchup to even out the score.

“Well she owes me. That’s why I think at some point I should play the Queen of Versailles and she could be my lonely dressmaker…” she said. “I mentioned it to her and her response was ‘dream on.'”

Watch last night's #IntotheWoods Q&A with Meryl Streep, @AnnaKendrick47 and more here: http://t.co/PLjKzajvpe pic.twitter.com/Whqz2f5XND

— Variety (@Variety) November 23, 2014

Blunt went on to share her real thoughts on the legendary actress.

“She’s so amazing it’s, like, annoying at this point.”