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Translation : To make unrealistic plans
Literal meaning : To draw up plans on the comet
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IPA : / tiʁe de plɑ̃ syʁ la kɔmɛt /
Comets passing close to earth are very rare and particularly brief events. Contrary to building projects, which requires a lot of time, patience and dedication.
This expression is based on this paradox. How would you jump on a comet, start making plans, and come back to earth in a few seconds?
You can't, that's why "Tirer des plans sur la comète" (Drawing plans on the comet) means "To make unrealistic plans".
Someone is talking to you about his revolutionary plan on how to become a billionaire in 45 minutes while sleeping. You can say: "Wow! That sounds awesome, I want to try!".
Or, you can say "Je crois que tu tires des plans sur la comète..." (I think you are drawing plans on the comet...).
You will find more variations with other pronouns in the next paragraph.
Dialogue
Un jour je serai milliardaire
One day I will be a billionaire
Arrête de tirer des plans sur la comète.
Stop drawing up plans on the comet
Bon ok... peut être juste millionnaire
Alright...maybe just a millionaire
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