black knight
US /ˌblæk ˈnaɪt/
UK /ˌblæk ˈnaɪt/

1.
cavalier noir
a chess piece, typically black, that moves in an L-shape, two squares in one direction (horizontally or vertically) and then one square perpendicularly. It is represented by a horse's head.
:
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The black knight jumped over the pawn to attack the queen.
Le cavalier noir a sauté par-dessus le pion pour attaquer la reine.
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He moved his black knight to a strong central position.
Il a déplacé son cavalier noir vers une position centrale forte.
2.
chevalier noir, chevalier maléfique
a mysterious or villainous knight, often depicted in medieval legends or fantasy literature, who is not aligned with any particular side or is an antagonist.
:
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The legend tells of a fearsome black knight who roamed the cursed forest.
La légende raconte l'histoire d'un redoutable chevalier noir qui errait dans la forêt maudite.
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In the story, the hero must face the mysterious black knight to save the kingdom.
Dans l'histoire, le héros doit affronter le mystérieux chevalier noir pour sauver le royaume.