8 letters · 12 points in Scrabble
verb engage in plotting or enter into a conspiracy, swear together
verb act in unison or agreement and in secret towards a deceitful or illegal purpose
originFrom Middle English conspiren, from Old French conspirer, from Latin conspirare, conspīrō, from con- (combining form of cum (“with”)) + spīrō (“breathe”).
Etymology from Wiktionary, CC BY-SA 3.0