English Translation
Watch your tongue, Mary!
This sort of sentence feels very hard to remember. How does this sentence mean “Watch your tongue”?
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Good news! It doesn’t! 
The French sentence means something like “Watch your step!”, but you would use it specifically when warning someone about something that looks like a stair or stairs in a staiway:
Also, “Attention” is more common than “Prends/Prenez garde.”
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