Definition
British slang meaning something or someone is exceptionally good, reliable, or trustworthy—essentially "sound" but amplified. It's the verbal equivalent of a double thumbs-up, reserved for people or things that exceed the baseline of acceptable and enter the realm of genuinely excellent. When being merely "sound" isn't sufficient praise, you upgrade to double sound.
Example Usage
Cheers for helping me move on your day off, mate—you're absolutely double sound.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=double%20sound&defid=15867199)
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