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Common knowledge (3-4)

Ross

I believe the answer is:

low-down

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'common knowledge' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?

'common knowledge' is the wordplay.
'common' becomes 'low' (both can mean vulgar).
'knowledge' becomes 'down' (I can't explain this - if you can you should believe this answer much more).
'low'+'down'='LOW-DOWN'

Can you help me to learn more?

(Other definitions for low-down that I've seen before include "Inside story" , "Info (slang) - dishonourable" , "Data - base" , "Mean, unfair" , "Inside information - mean (7;3-4)" .)

I've seen this clue in The Globe and Mail.
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