deep background
The status of information acquired from a source that may be used, but without either…The status of information acquired from a source that may be used, but without either naming or directly quoting the source.
Meaning
1 senses(US, uncountable)The status of information acquired from a source that may be used, but without either naming or directly quoting the source.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable