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French word derrière comes from Latin ex, e (A name of the letter X. (+ ablative) out of, from.), Latin retro (Back, backwards, behind. Before, formerly.)
ex, e (Latin)
A name of the letter X. (+ ablative) out of, from.
retro (Latin)
Back, backwards, behind. Before, formerly.
derrière (French)
Bottom, bum, backside Behind Behind.