keep (something) on the down low

To keep something in a state of secrecy or minimal public knowledge; to not share something with anyone else. Keep this on the down-low, but Janet is planning to break up with Kevin next week.

Common Names:

Name	Pronounced	Usage
Vladimir	vlah-DEE-meer (Russian), VLAH-dee-meer (Croatian)	Russian, Serbian, Croatian, Bulgarian, Macedonian, Slovene, Medieval Slavic
Sylvaine	seel-VEN	French
Claudius	KLAW-dee-əs (English)	Ancient Roman
ĐUrĐA	JOOR-jah	Croatian
Lug	-	Irish Mythology
Usoa	-	Basque