down low

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An openly heterosexual man who engages in sex with other men without disclosing it to his female partner(s)

down low

, downlow (down′lō″) [Slang, short for on the down low, to keep a secret, in secret],

DL

1. Keeping an act, a plan, or some information secret.
2. Leading a double life, esp. with respect to sexual preferences. It usually refers to men who represent themselves publicly as strictly heterosexual but secretly have sex with men.
References in periodicals archive ?
Redesigned departments include the combination of UpFront and DownLow to create a new super-department called Itineraries, as well as the addition of Briefs, which highlights both a celebrity and a destination.
They keep it on the downlow, because on a team that has major-college prospects like running back Milton Knox and linebacker Donovan Carter, it's a little presumptuous to suggest that a 16-year old kid who only began playing football two years ago and is still learning how to run routes could ever end up being better.