re-surveillance
A follow-up sub rosa investigation after an unsuccessful or unfruitful covert…A follow-up sub rosa investigation after an unsuccessful or unfruitful covert investigation.
Meaning
1 senses(uncountable)A follow-up sub rosa investigation after an unsuccessful or unfruitful covert investigation.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable