On-the-down-low meaning

(US, idiomatic, slang, euphemistic) In secret.

I'll tell you, but keep it on the down-low.

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(US, idiomatic, slang, euphemistic) Secretly sleeping with someone other than one's partner.
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(African American Vernacular, LGBT) (of a male) Publicly identifying as heterosexual but secretly having sex with other men.
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