Expression: Découvrir le pot aux roses
Pronunciation: [day koo vreer leu po to roz]
Meaning: to uncover a secret
Literal translation: to discover the pot of roses
Notes: The idiomatic French expression découvrir le pot aux roses means to find out something that was kept secret for some reason: trickery, shady business, misdeeds. The origin of this expression is unknown; theories range from love notes once being hidden in flowerpots to the secrets of making perfume.
Variation: dévoiler le pot aux roses
Misspelling: le poteau rose (literally, "the pink pillar")
C'était en écoutant leur discussion secrètement que j'ai découvert le pot aux roses.
It was by secretly listening in on their discussions that I found out the secret / uncovered the plot.