The most comprehensive online collection of UK street, road, and grime slang - authentic definitions, real examples, and cross-linked meanings from the culture. The only dictionary that shells itself.
Swear Down
phrase
Tell the Truth;
Used to stress that what someone’s saying is true or not exaggerated. Common in grime and road talk, it carries a tone of emphasis or disbelief, either to convince someone, (similar to “I promise!”), or to react when you’re shocked at what you’ve heard, (similar to “do you promise?”).