One idiom dominates, and it even has a verlan form.
« Laisse tomber ! » — literally let it fall — means forget it, never mind, drop it. It is everywhere in spoken French, used to end a topic, wave away a favour, or give up on something.
Its verlan form « laisse béton » (béton = tomber reversed) was made famous by a Renaud song and is still understood by everyone, though it now sounds deliberately retro. Younger speakers just say « laisse tomber » or, shorter, « laisse ».
💡 Focus at this level: Native slang
1. « Laisse tomber » = forget it. Learn it before anything else here.
2. « Laisse béton » is verlan and dated but universally understood.
3. « Laisse » alone works between friends.
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