Also means
rust-colored sauce (Provençal)
Usage Note
Rouille means rust on metal, but it is also the name of a spicy saffron-and-garlic mayonnaise served with Provençal fish soup (bouillabaisse), named for its rust color. The adjective rouillé(e) means 'rusty' and is also used figuratively for skills that have grown 'rusty'.
Examples
"La rouille ronge le métal lentement."
Natural Translation
Rust slowly eats away at the metal.

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