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(un) esprit = mind, spirit (the 't' is silent)

E.g.
perdre ses esprits = to faint (literally: "to lose one's spirits")
reprendre ses esprits = to regain consciousness (literally: "to retake one's spirits")
les grands esprits se rencontrent = great minds think alike (literally: "great minds meet")
avoir l'esprit mal tourné = to have a dirty mind (literally: "to have a badly oriented mind")
avoir de l'esprit = to be witty