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“4” is a French slang expression used to mean “fort” (strong, powerful, or impressive). It originates from a wordplay mixing French and English: the number 4 is pronounced like “four” in English, which sounds similar to the French word “fort”. This shorthand is commonly used in online conversations, social media, gaming, and texting to quickly praise something or someone as impressive, strong, or excellent. It is often associated with the expression “13 4 (Treize Four)”, which amplifies the meaning to “très fort” (very strong / very impressive). Using just “4” is a faster, more casual way to give the same compliment.
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