(one) is on the DL

1. slang Said of a man who has sex with other men but considers himself to be heterosexual. In this usage, "DL" is a shortening of "down low," referring to a state of secrecy or minimal public knowledge pertaining to these sexual activities. I never thought he was gay, but then I started to hear rumors that he's on the DL. If that hottie is on the DL, could you introduce us? One's sexual activity can differ from one's sexual identity, as in the case of men on the DL.

2. One cannot currently play a sport because of an injury. In this usage, "DL" is a shortening of "disabled list," which, in sports, is a list of injured players. Well, our two best players are on the DL, so I'd say our playoff chances are looking grim. Who is going to pitch tonight if Drew is on the DL? A: "But I thought her knee was getting better." B: "It is, but I hear she's still on the DL."